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Not. The problem is not even about which font is actually more accessible. It's the self proclaimed reasoning. Rubio, by his own words, states that the change is about aesthetics and anti DEIA politics.
However, if you want to argue about actual accessibility, which is not what is happening in the Dept. of State, the US government's own accessibility guidelines contradict the idea that Serif fonts are more accessible; https://www.section508.gov/develop/fonts-typography/
Do you happen to know anyone with a reading disability at all? A dear friend of mine has dyslexia, and I've seen first hand how important this stuff is for his comprehension.
As for the politics of that government, a history lesson; In 1930s Germany, Liberals did nothing to abort the rise of NSDAP, seeing them as economic allies if not political allies. They sold out their country and turned a blind eye to genuine evil for profit and the reduction of the political influence of their workforce.
At least be thoughtful and say "Won't" (because they prefer management)