From the EO:
Section 1. Policy. The Federal Government must have the ability to communicate at all times and under all circumstances to carry out its most critical and time sensitive missions. Survivable, resilient, enduring, and effective communications, both domestic and international, are essential to enable the executive branch to communicate within itself and with: the legislative and judicial branches; State, local, territorial, and tribal governments; private sector entities; and the public, allies, and other nations. Such communications must be possible under all circumstances to ensure national security, effectively manage emergencies, and improve national resilience.
So government communication takes precedence over all other kinds of communication.
5.2(e) satisfy priority communications requirements through the use of commercial, Government, and privately owned communications resources, when appropriate;
They can "seize" when this new "committee" decides it's necessary.
He also revokes Reagan's EO which says this:
3.e.1. [the government must] Plan for and provide, operate and maintain telecommunications services and facilities adequate to support the National Command Authorities and to execute the responsibilities assigned by Executive Order No. 12333;
That EO says the government must maintain its own facilities, and outlines war powers and non-war emergency powers, but says the government has to make sure its own crap works in emergencies. This new order says the new "committee" has the authority to ensure that private communications assets work in emergencies so that the government can seize them when such an emergency is declared. The committee also has the authority to decide when such an emergency exists.
No tinfoil required, to see this as another power grab.