I've seen that article and no, we still don't need to be worried. Just defederate and that's all. As evidenced by the final paragraph:
Fediverse can only win by keeping its ground, by speaking about freedom, morals, ethics, values. By starting open, non-commercial and non-spied discussions. By acknowledging that the goal is not to win. Not to embrace. The goal is to stay a tool. A tool dedicated to offer a place of freedom for connected human beings. Something that no commercial entity will ever offer.
Just keep using it as the community building tool it is, defederate and protect those communities and we're golden.