It's just another case of him having a hate boner for Valve. Years ago, he asked Valve to do something via email and Valve ghosted him while doing the exact opposite.

His behavior and attitute towards Valve, in my opinion, is consistent with somebody who has hurt feelings and a grudge. There are actually legitimate things to criticize Valve over, but him having a go at the things that benefit consumers instead of devs just makes him look like a giant anti-consume douche.

He’s desperate for attention. He’ll say anything if it gets people talking about his company.