Texas has been growing rapidly in some areas, the thing is though is the political redistricting which means those voting power may skew towards those in rural areas. So if you see, for example, a technology company in a city like Austin trying to evangelize connecting to community to flip the vote, it might be effort done within a vacuum with less effectiveness than perceived.
(Yeah, parent comment has changed.)
A large factor is immigrants that went through the tedious years long drudgery that is the legal process for US citizenship being really pissed at the fact some may not have to go through the aforementioned like they did - misery loves company or something like that.
Another is that these immigrants and minorities are typically fairly uneducated and truly believe the man with the golden shitter is actually like them and is going to help them.
And some of it is trying to fit in with the preexisting community. If you're a brown person in a town of white religious/nationalistic fanatics that typically do not like brown people, vowing your loyalty to their guy is typically a quick way to fit in a bit better.
I know reddit isn't representative of the state but both /r/austin and /r/texas have had this conversation many times.[0][1] I personally agree with the thesis that Texas GOP see's the demographic writing on the wall and want to limit to more liberal immigrants.
And because I already saw a comment mentioning it, I want to add that as a Mexican born and raised a border town I think the flipped Hispanic counties on the border are an anomaly. If you investigate the counties, like Zavala, that flipped, they are 1 largely blue collar men which love Trump (my roofer uncle), and 2 Zavala was actually one of the few counties that LOST population according to the 2020 census. The correlation is visible, the counties that had the highest population decline in Texas voted most heavily for Trump while the fast growing suburbs are now purple and blue. In this booming state the poor counties losing money and people are the ones voting GOP.
[0]https://www.reddit.com/r/Austin/comments/phszk7/anyone_sudde...
[1]https://www.reddit.com/r/texas/comments/pgjze1/anyone_else_g...
This is a dangerous fallacy. As has been widely reported, Trump increased his standing with minorities in 2020 vs 2016. In some heavily Hispanic areas along the Texas border the swing toward Trump in 2020 was over 40 points compared to 2016.