No. The schematics are public. Check for yourself.
In the original post, I’m not sure whether you mentioned the state of the cellular modem kill switch. If the WiFi is off and the cellular modem is on then you should still be able to post to this forum (in a general scenario). I can believe that the status icon might get confused occasionally and not appear / disappear when it is supposed to.
It is probably too late to investigate but I would be checking at the shell prompt for the true state of the two networks and looking for journal entries.