Lots of managers "could manage any club in the world", although a lot more couldn't. I've always rated Moyes, although he's maybe missed out on significant achievements, other than getting Everton where he did year after year. I'd have taken him here, in spite of many not wanting him. MU wasn't really his fault; he was shafted by transfers which didn't take place.
There are a few aspects to it. Xi said he wanted China to win the world cup. Anyone who helps with that gets political brownie points.
A bigger factor is that the Chinese are very nervous that their government could revert to Mao style communism and confiscate all of their assets. Keeping those assets outside the reach of the CCP makes them safe.