"Skill can be bought" means that people buy cheats left and right and that the game is infested with cheats to a point where it's unplayable.

Even pro players complain about the state it's in and a lot of streamers left the game until this is fixed. Pretty similar to the situation in Tarkov.

You want a source? A simple search for cs2 cheating on Youtube should suffice.

The cheating is so bad that pros complain and streamers leave the game until it's fixed. Just search for it on youtube and watch the videos.