We now cant trust anything Sam said throughout the whole season SPOILERS
Since we know Sam was the killer (I suspected it when he went to get Johns bag that had the finger in it, and also when he killed the black guy that locked him in the room)
Any way since we know he is the killer...the information he said he got by reading lips while captured at the hospital is suspect.
I thought it was strange that the new group planned to just murder axel and crew.
So I think Sam lied about it just to get the other group killed.