I wouldn’t assume that yet. Chaim hasn’t spoken negatively of Cruz these last 1 1/2 years, most of the time he mentioned the Texas senator, he praised Cruz’s principles and moral values over Trump’s. Even if this senate race was between “the lesser of two evils”, which I doubt, O’Rourke being in the senate is a horrifying ordeal that no sane conservative could sit home and allow.
The Texas race hasn’t been this close until now, so that could be why JTF hasn’t made a video, assuming that TX will be red by nature. It’s a dangerous bet at this point.
Even where I live, this blue trend is both unexpected and scary. It’s hard to pass through a Houston or even Ft. Worth suburb without seeing a grisly, black BETO yard sign.