What the POTUS does doesn't make something Constitutional or not... Where in the Constitution does it grant power to the government to mandate buying and wearing something?
I didn't comment on the constitutionality of it. I answered his question, in part, about "why now".
Lots of folks are wondering why the CDC has changed it's tune on masks...but the CDC is pushing it, so is the surgeon general, and that gives little local dictators like Norman's mayor the ammunition they need to get their mandates passed.