In that context, communicate is scoped to flight crew outside, not within the cockpit crew.
Surely, the notion that if you have a departure from controlled flight, or are lost, that each crew member must refrain from speaking to each other is silly.
That guidance is instead intended to say "ATC's questions and needs can wait; tell them 'Standby' and fly the airplane."
According to the articke they didn't speak to each other to resolve the problems. Asking them to refrain from talking would be silly, but an explicit instruction to communicate might help.
Surely, the notion that if you have a departure from controlled flight, or are lost, that each crew member must refrain from speaking to each other is silly.
That guidance is instead intended to say "ATC's questions and needs can wait; tell them 'Standby' and fly the airplane."