There are many, many schools that are considerably wealthier than Vista Ridge who have never won State or don't consistently place in the upper half of Finals in major competitions.
Seems curious, huh?
It's a UIL contest, so they will and should use UIL classifications. Full stop.
And honestly, the rest sounds a lot like irritation at the really good, consistent bands being really good and consistent.
The marching band alignment to Areas has nothing to do with UIL realignment, other than the classification of the schools to 4A/5A/6A.
Area alignments are handled by TMEA.
Realignment results in a domino effect, so it's a tough process to initiate. The #4 qualifier from J narrowly missed Finals, but still missed. So at least we know the Finalist level bands all advanced to State, which to my mind is the first aim of Area.