Ok?
Does playing bullet affect beginner players?

If you just want to play for fun, and aren't too worried about improving, then bullet is completely fine.
But if you want to seriously improve, then you should stay away from bullet, until you're at a much higher level.
All bullet really does is force one to play without much thought. And beginners absolutely need to be thinking about their moves.
In bullet, even if the beginner isn't sure what to play, the clock keeps ticking, so they feel forced to play anything to keep moving.
That's the opposite of deliberate practice, and how bad chess habits are formed.

He’s a retired otb player and has experience.
And in this case, he’s right, speed chess can really stall progress by instilling bad habits. I set a goal in January this year to reach 1800 rapid. Now that I’ve reached that goal, I’m no longer interested in improving, so I play speed chess when I feel like.

It's not great...But if you're playing it for fun, on top of all the other studying you've already done, then it's not so bad.
If you're playing bullet to get better at chess, and no other studying, that's not going to work out so well.
Does bullet really affect performance?