I'm no fan of his, for various reasons - some non-football related - but your takes are patently absurd and petty at best. As Corto has said, he has evolved markedly from a guy who coached Croatia a handful of years ago, he made the most from the players he was given, created a system that fits with the personnel he had at his disposal and outperformed the expectations put before him. Yet you feel the need to talk in absolutes and proclaim him a failure before he even coaches a first match at Bayern.
Is it possible he bombs? Yes, it is likely. Is it a dead certainty? No it's not, even though he is not the hipster German pick like Tuchel, Nagelssman, Favre etc.