There was a short factoid about thabeet and his hands years ago. You need to realize these quotes are from 20 year olds having conversations with journalists for a few minutes tops, at a time.
It's just a random nugget of info. Thabeet did sand work, and a lot of other work, to improve his hands.
It's unclear to me why you would think an accomplished (albeit flawed) coach, would not work on a players hands. EVERY player works on hand strength.
Brimahs lack of rebounding ability is due to strength and instinct, same with his hands. It's not something he's going to change on this point.
Kevin Ollie doesn't need p prove to you or anyone else that he is doing hand, catching, passing drills and training with brimah. If you think it's a good idea, imagine what a real basketball coach is noticing when reviewing game film.
Again, most of what happens in training is not put in an article. Most of what you read in articles isn't remembered years later. Ollie doesn't need to say they're doing hand strength training. Only a buffoon wouldn't.