I agree, CSGO being played online is completely different from a huge LAN setting where you have an audience and everyone is watch you. The stress levels must be so much higher sitting in the cubicles with cameras all around, playing on standard PCs, etc.
The pressure is intensive in LAN games for CSGO players. Even not only for the CSGO players but for every esports games that we have. There is a big difference playing online and LAN because in online, you can be relax as no one watches you live although there are audiences through live streaming and casts of the games. But forget about LAN games, every LAN game tournament has been stopped because of the pandemic.