Well, they're not (something being "demonstrably true" means that you can demonstrate that it's true), but I'm not surprised that you say that.
California is our biggest state by population, and less than 1 in 3 residents have Mexican ancestry. Not sure the exact numbers for our biggest state by land area, but it's less than 1 in 20. Also, neither of those points are relevant to the discussion. What the heck was the point of bringing them up?
"Constitutional conservatism" has never been common on the right. I don't think the GOP holds new far-right positions, and I haven't said that they do. The intensity of the anti-immigration mania on the party has been turned up a few notches, though. Probably more outright authoritarians (witness
@Corn Pop Hombre's point about the response to protesters), though as I said, that's long been an element in the party.