I’ve read a lot about @|dessalines@mastodon.social, even his blog. I can say for 100% certain that he is not a Nazbol.
He has a lot of good resources on known software from a left perspective, like why one should not use Signal:
https://dessalines.github.io/essays/why_not_signal.html
He always has his sources cited etc.
The software itself has many problems, but I wouldn’t attack Dessalines directly.