That does not seem accurate. SteamSpy estimates 16.11m units sold for HL at the time of this posting while BG3 has an estimated 28.67m units sold. But I guess consoles are probably a massive chunk that I can't see. But again, the poster on twitter says they have 28 million HL sales, it'd be hard to believe steam outsold all the consoles with those number estimatins for HL.