You mean someone being forcibly brainwashed goes against the theme of the planet that forcibly brainwashes its citizens?
Not following that one.
It's the whole secret police angle. That just doesn't seem like something they'd actually do. Given the culture most of them would simply see it as a part of life or even be excited to take it since it's a sort of coming of age ritual for them. Since it is mandatory, though, it feels much more New Texas to simply soft exile anyone who doesn't want to get Treated - more of a "leaving the nest" sort of thing, but still a firm notion that if you refuse the Treatment then you're refusing to live there.
Giving them a goon squad doesn't seem particularly necessary (how often would they even need it, really?) or consistent with their culture; they -are- open about who and what they are and the sinister aspect is clear, too. If the PC takes the Treatment they know what they're getting into. Giving them some blatant hidden dark side like that violates the spirit of the place. Plus force-Treating people who aren't citizens was already agreed to be a line that shouldn't be crossed to the point where the Steph episode was altered. In-universe the Treatment runs a very tight legal line and that would be over it.
There are definitely better, more lore-friendly, and honestly sexier ways to go about this. In my eyes the compelling part of Reaha's character is that she's so torn between fetishizing the idea of being a cow and fighting the idea with everything she has. I just don't think it's a good step in her character arc for the decision to be so literally forced on her. I've seen Savin agree that New Texas shouldn't go in the direction of sinister secrets since that's missing the point so I can't help but think, having been there a couple of times myself in my own writing, that he's
A) Getting a little too caught up in the idea of Reaha as an anti-Treatment mouthpiece to the detriment of the character - that's part of who she is but she is a character and whether she ultimately decides to resolve her internal conflict by getting Treated or finally, once and for all, rejecting it that should be her choice
B) Not entirely sure how he's going to get Reaha to the point where she'd take it; i.e. he's hitting a wall where he knows a direction she's been promised to go in but isn't entirely sure how to make the character get to that place and so he's literally having to force it to happen
I do think it would be a mistake to do it this way both because I think he's got that arc in him even if he's having trouble with it but also because I doubt too many of her fans want that to be how it happens. Whether you're treating her as a waifu or as a slave it's better from both angles for it to be something Steele helps with or insists on. There's just a lot more emotional gold to be mined from that.