I don't entirely agree. Which is perhaps to say that I don't agree at all. Because I think you're missing out on a lot of nuance.
There's definitely that part of the base that is openly white supremacist and is happy to cheer on the murder of non-whites. It's not an insignificant number. Actually, it's a pretty disturbingly large number.
But that part of the base has its limitations. For one thing, it's probably not a majority of the GQP base (though maybe it is). But more importantly, it's not really the part of the base that has the money that funds the Republican Party of Texas.
That part of the base--the TAB and the the TXOGA types--are racists. Let's not mince words on that. But it's a more genial and hidden racism. They don't want blacks moving into Highland Park and living next door to them. But they're not going to drop a racial slur. At least not in polite company. That's because while they may be racists, they don't want to be seen as racist. That's in part because they've largely convinced themselves that they're not racist (it's the people who believe CRT (whatever that is) who are the real racists, you see).
So they're not going to side with an avowedly white-supremacist murderer. And they're not going to want Abbott to, either. Because that makes them look bad.