I think it's funny that you think that tech workers would protest police brutality against black men, let alone in such a way that would put their jobs on the line.
Microsoft refused to allow police to use some of their facial recognition technology because of this, and it was before BLM.
I would question if that has changed in a significant way since. I also don't know that a single anecdote suffices. I've seen enough just on this site to be confident in my wager. You're going to find more tech workers who are hopping mad about DEI than ones who would risk their employment or perception of their own safety for the safety of black people.