Clearly planned to hold an event? On what evidence do you have to possibly make a statement like that? There wasn't even so much as a peep of a hint.
This talk has GDC stuff in it. You think Sony would unveil PS5 specs at GDC without first announcing the console?
So have the PS5 specs be announced via leak?
If they were doing deep dives at GDC then they were going to announce the console before that.