IAMA physicist, but not a very good one and this isn't my field.
From what I gather, they got liquid helium to react to the wavefunction of an electron without reacting to the electron itself. In other words, an electron approached the surface of a vat of liquid helium, the helium reacted (by forming bubbles), but the electron continued and eventually reacted somewhere else.
If true, this is really, deeply, weird. The wavefunction is supposed to be just a mathematical model of where the electron should be. Instead, this suggests that the wavefunction is a field with physical reality. A physical reality that can be studied in parts, not necessarily as a whole. It's pretty mindblowing and could lead to new physics -- gluon-like particles that carry wavefunction potential, maybe? But I'm skeptical until these results can be duplicated.
Note that the entire article is written in adherence to the Copenhagen interpretation. If you look at it via the Many Worlds interpretation of quantum physics, it gets even weirder -- is the helium responding to events in parallel universes? Luckily, I've always preferred the Copenhagen theory.