IIRC, this VC-25B 'Bridge' is not intended to operate in contested airspace or land in combat zones, unlike the VC-25A with former POTUS. That's why it doesn't have countermeasures systems.
It wouldn't really need such systems if it's going to stay in North America.
in 2028 the aircraft will be transferred to the Trump Presidential Library Foundation.
And I have no doubt that as soon as a Democrat is in the Oval Office it will be transferred someone where else.