What bothers me about the decision is their rationale. If they had just switched without any explanation, it would have seemed more judicious and politic, befitting a department of state. Even better would be to announce a thoughtful font choice with reasoning based on the font itself, without defaulting to some thoughtless option "because that's the way it was done in the past", and moving away from the existing choice "because DEI". As it is, in my opinion, they made themselves look like idiots by obsessing over fonts from the perspective of something like DEI, as if they are paranoid over any possible subatom of DEI infecting their presence. Rubio couldn't just make it about the font, so to speak, he had to get hung up on irrelevant details which makes him (in my opinion) look worse than anything he might be criticizing.
If you read the original announcement, my impression was that the choice of Calibri was because it it made state department functions easier as Calibri was the default in commonly used software (which seems kind of a poor reason to me, but one I can respect on practicality grounds). Legibility was also a concern (as it should be in my opinion). So something functional about Calibri (legibility) becomes "DEI" which is almost like cooties for this administration. Even if you disagree about the legibility of Calibri, denouncing legibility as a criterion per se seems absurd to me.
The whole decision seems like a joke to me and a lost opportunity to set a decent design standard.