I used to be a redactor on a french csgo website (vakarm.net) and we were in contact with pro players.
At ESWC (an event that was quite important before the majors) players told us they could hear some infos, and it was game-changing. After that, events tried to force players to use the same kind of headset that was supposed to be soundproof but it was inconvenient for players not to use their stuff.
At pro level, they get a lot of automatic reactions, you don't even know you looked at the radar but you do it all the time. They can focus on many things at once and that basically is mandatory for Counter-Strike. They don't get their full attention on what commentators are saying but you can easily catch important infos.
Thanks for the Bot Connor's video, unbelievable stuff ![]()