Bulk comes from diet. I always find it funny when folks (usually women) talk about "not wanting to bulk" if they touch a 10lb dumb bell or squat the bar. It is SO HARD to gain significant muscle mass. Natty body builders work at it for years to show moderate growth. I've lifted 3x or more a week for 20 years and can't gain more than a couple pounds unless I go hard on calories and protein.
Basketball players definitely lift heavy though, particularly in the off-season. If you want to get strong, you need to lift heavy. There's no way around it.
College basketball programs aren't going to be having guys do olympic lifts or anything. Even deadlifts are off the table in many programs. But big compound movements like squats, cleans, trap bar deadlifts, presses, etc. are a part of the game.