While all differ on the exact numbers, they agree in broad strokes. The median voter is highly worried about inflation. Democrats are worried less about inflation, but still quite a lot. Indpendents are virtually indistinguishable from Republicans in worrying a lot about inflation.
That means that the inflation/hard money bit from the GOP is not an appeal to the base. It’s actually a reach to the center.
Worrying about inflation may be wrong– and I think it is wrong, according to the data– but it’s an attempt to go after the median voter, not play to the base.