The whole point of mentioning FTL communication is to challenge the idea that we understand enough. Our current understanding of causality makes us believe tha

The whole point of mentioning FTL communication is to challenge the idea that we understand enough. Our current understanding of causality makes us believe that FTL communication is 'likely not possible'. If FTL communication is possible, it just means that our understanding of causality is wrong, and if that is the case it was never 'likely not possible'.