Nope. A lawyer argued in court that they could legally change the party charter, in to win a court case. Which they theoretically could, but if they tried to alter the charter this close to the election it would be overturned in court for a great many reasons.
Thinking that “DNC” small group of caretakers can choose anyone they want shows that you have a profound lack of understanding of how things actually work. Legally, control of the DNC lies in the hands of the newly elected delegates. The small caretaker group does not have the power to purge the much bigger general membership of already elected delegates. If they tried to, every single DNC delegate elected this year could sue the caretakers and would very easily win that lawsuit. Furthermore, the party charter bounds the delegates to Biden on the first ballot. Biden will have to be convinced to formally release them before they could legally vote for anybody else.
The reason why you have a profound misunderstanding of how things actually work is because you were subjected to an onslaught of Kremlin propaganda in 2016 without knowing the source. And that propaganda gave you a dunning-kruger effect of vastly overestimating your knowledge of how the political parties actually work.