Probably a lot less susceptible.
The main concern with MRI and pacemakers is not so much the magnetic field but the RF field. The magnetic field is not without problems as most pacemakers contain a reed switch which is used to activate "safe mode", where the pacemaker enters a special diagnostic mode. This is largely for historical purposes, as early pacemakers used this for battery level testing. The doctor would hold a magnet to the patient's chest. The pacemaker would enter diagnostic mode and would stimulate the heart to beat a rate dependent on battery voltage. The doc would feel the patient's pulse and could look up the estimated battery level in a table.
Modern pacemakers contain rather more sophisticated NFC capability, so much more useful readouts are available with a proper scan tool (battery voltage, stimulation mode, inputs from various sensors, lead impedances, stimulation voltages and currents, etc.) as well the ability to reconfigure various modes (e.g. vibration response - where the pacemaker increases rate in response to exercise induced vibration), whether the pacemaker can sense other heart parameters (so that different chambers of the heart contract synchronously), etc. In general, however, a magnet will switch the pacemaker into a basic mode of operation. (Defibrillators are different, as basic stimulation can be very dangerous in people with severe heart disease, as it can trigger ventricular fibrillation; therefore magnet mode in implantable defibrillators usually only just tweaks some parameters, rather than anything more dramatic).
The major issue with MRI is the RF field. MRI requires a very powerful RF pulse. A typical MRI power amplifier will take up 6U of rack space, and about 5 gallons per minute of cooling water and need a 3phase 480V power supply, while providing a peak RF power output of 35-70 kW.
A modern pacemaker will typically sense the ECG as well as stimulating. It will include a watchdog timer, and if a beat is not detected before the timer expires, it will trigger a stimulation pulse. One risk with the MRI environment is that the capability of the pacemaker to sense the 1 mV ECG signal may be degraded by the pulsed transmission from the 70 kW RF transmitter 6 inches away.
There are other issues with conventional pacemakers. Being implanted near the shoulder, the pacemaker connects to the heart muscle via leads approx 8-12 inches long. These typically form an arc in shape due to the anatomy. It just so happens that this wire loop forms quite a nice 1/4 wave loop antenna tuned to the scanner's RF frequency; it can absorb the RF energy and channel RF into the tissues around the pacemaker "box" and at the electrode tips. In minor cases, the RF pulses can act as pacemaker pulses on the cardiac muscle. Fine at 1 Hz scan rate. Not so good at 5 Hz scan rate. In extreme cases, the voltage build up across the pacemaker leads can cause RF burns to the cardiac muscle or damage the pacemaker circuitry. (There are MRI compatible pacemakers around which use various tricks - upgrading from normal coax cables to coax with heavy copper screens so rigid that they actually have to be articulated in order to bend + a liberal helping of ferrite beads; or dividing the leads up into 1" segments interconnected by small ferrite transformers)
The nanostim device doesn't have any exposed leads, so it is likely to be much less susceptible to RF problems. Due to size and location, it's also likely that it doesn't feature a conventional magnet mode, relying instead completely on NFC for control and communication. It also has the option of being completely removable. Conventional pacemakers often aren't, as the leads are generally not retrievable from where they screw into the heart muscle. Because it is RF pick-up in the leads that is the No 1 hazard with MRI, simply removing the pacemaker device, but leaving the leads isn't a safe option (it may actually make it worse, as the pacemaker itself often contains clamping and termination circuits to protect itself from EMI, and this serves to absorb some of the RF pick-up from the leads).
So this looks like a very interesting device. However, by the looks of things it can only offer single "lead" functions (i.e. sense the presence or absence of a beat, and stimulate when a timer expires). This type of pacing is "asynchronous" as it is not synchornized with the top of the heart. In normal cardiac operation, the top (atria) of the heart beat first, pumping blood at low pressure to the bottom (ventricles) of the heart, where the pressure is boosted. In asynchronous pacing, cardiac function is reduced as the top and bottom stages of the heart are desynchronised. The preference with conventional pacemakers is synchronised pacing, where an atrial electrode senses the atrial ECG, and when a beat is detected, it triggers a ventricle stimulation after a physiological delay.