I'll support him and wish him luck but I'm really not sure about him. There is a lot to like about much of the stuff you read about him but this Bielsa Disciple also seems to be overplayed. He only spent 2 years with him and was already at Leeds.
Huddesfield finished 18th in 2019/20, their first season after relegation. Corberan took over and managed the whole of 2020/2021 and they finished 20th. It seems to me some people seem unaware he managed that season or think he took over part way through. He was very luck not to get sacked that year.
2021/2022 he did an amazing job, no doubt about that but it was one season and maybe everything just clicked. He may have learnt a lot though. It was certainly progress which is what you want to see and I'll be happy to trust progress on the eyes even if results are sketchy. I dont know if that was the case at Huddesfield and you could see it was better than results appeared the season before.
At Olympiacos he also struggled at the start. We will never know if he could have turned it around but we do know they've won 3 and lost one in the league (which was to another big Greek club - PAOK) since he left. I appreciate Greek clubs seem to be basket cases though. I've heard podcasts where players have spoke about what its like and it seems crazy.
Whatever anyone is saying about patience now though, it is easy to say it at the moment and I am sure people said it about VI. If we finish lower than 16th people will want him out, if we are relegated he certainly leaves.
Hopefully we see some positive signs before the world cup but we play 6 games after we return and before the window opens (including new year). They look crucial in terms of not only us showing signs of improvement, but him buying some patience.
My understanding is that 20/21 was a pragmatic, make do season and as you suggest, many managers may not have survived it. 21/22 he vastly changed the regular starting 11 and changed system, think he went 3 at the back, but patched the side up with loans etc. I am hoping that season is more representative of what he is about, but I don't think it will be all plain sailing. I do think we need to give him time.