Hmm? It was released for two plus months? 5.6.0 and 5.6.1

I'd also say this wasn't a good example of 'linux handling it better': usually when a mess like this occurs on windows all the corps get a quiet tap on the shoulder that they need to immediately patch when MS releases it, then a few days later it hits the news. In XZ's case, the backdoor was published before the team knew about it, huge mess.