Some people knocked on Mr. Musk for laying off a bunch of folks after he acquired the company, but really company purchases and transitions are common this way as new owners try to reshape the company they buy into their vision and sometimes to turnaround towards profitability based on theirs or different business models; sometimes it works, sometimes it doesn't; only time will be the judge.
It's more that he didn't give notice, which is a violation of various state laws, you can't just wade into a company, and tell people they are fired, without notice, I'm sure it's legal in some states of the US, and some countries, but even then, that doesn't make it morally right. Though, the dismissal of people isn't what I wrote the article about, that is a different subject, the article is about the disaster of Twitter Blue, and how open it is to abuse, as well as scams.