Welcome to the forum Kermit01.
Yes in parking guard things like wifi is turned off to use less power, and of course also generate less internal heat which is important when parked on those nice summer days.
Even many smart cloud enabled systems with 4G connection, they too turn off the 4G radio to save on power, so at least when the car is parked and nothing happen you can not reach the camera on 4G, this can only be done when something have triggered the camera to wake up and record, then such systems most often send a notification to your phone.
And then you can reach the camera at least until it go back to sleep mode.
Some newer systems have a chip so you can actually access those cameras at any time via your phone and the dashcams 4G modem.
But your camera i dont think is a smart camera so it is simply out of reach in parking guard mode.