The ISPs are compelled by judicial order to take down whatever LaLiga tells them to, and LaLiga is telling them to block the entire IP range. They can’t not do it.
Of course, LL could still give them hell in court even on false grounds (and maybe even win anyway, given the case detailed in the root comment). And in any case there's simply no commercial reason why they would stick their neck out in the first place
I know when eSNI / ECH came out, Cloudflare at least made a point of taking about plans to use it to frustrate targeted blocks in hopes that governments would be unwilling to respond by escalating to blanket IP blocks.