His last time trial win was in 2018, so I don't think it's any surprise he hasn't been selected. I'm surprised the Guardian lead with it to be honest, I'd read the squad details elsewhere and it didn't even register he wasn't in it.
Well, The Guardian isn't fully committed to Cycling coverage, but even their Sports Desk must have heard of Geraint Thomas.
He has found a number of ways to lose time trials.
It's all downhill, from here, for Geraint:
https://www.theguardian.com/sport/article/2024/jun/24/double-gold-medallist-geraint-thomas-dropped-by-team-gb-paris-cycling