I'm far from being versed in this, but when I read the wikipedia article, it's about whether CONGRESS can dismiss someone without approval of the president, not the other way around.
It also cites https://en.wikipedia.org/wiki/Parsons_v._United_States
Which DOES say something about whether the president has the power to dismiss, among other officials, district attorneys:
https://scholar.google.com/scholar_case?case=755666055204146...
Myers addressed a law requiring Senate approval for a removal. The court struck down this law, leading the case to be considered a definitive rejection of strict enumeration. You can read more here- https://constitutionallawreporter.com/2019/05/09/myers-v-uni...