Is it going to make any difference?
PS5 isn't a 'new' product so doesn't need implanting. The public consciousness already has PlayStation implanted with it being one of the strongest brands in the world. The brand isn't presently fading away. I can't see any evidence that Sony needs to make a move now or that there'll be any fallout for them maintaining a prolonged silence, and it's easy to come up with situations where the late discussion is actually beneficial. eg. Coronavirus is ended, lots of misery wants to be got past, bam, here's the future, PlayStation, fun fun fun after all that quarantining and shitty bums.
I can see cases for a positive impact. I can't see any for a negative on being late. The only negative I can see is inadequate marketing and not enough noise, but that's not dependent on duration of that noise. As long as PS5 is properly marketed ahead of release, it'll do as well as if Sony had been talking about it for the past three years non-stop.