Well, the first letter was obviously read, with three new judges!! Can't argue that one. That's proof enough for me and I'd assume others.
Now will Trump and a few others read the latest? Somewhat doubtful but, the important one, is the one suggesting a rehearing of the decision to institute. Now, that would be HUGEEE!! It would only stand to reason that in order the make the patent owner whole with new judges, they would need to rehear the IPR Petition (s) Institutional Decision. One would think. Apple wouldn't like this and I'm sure they'd try to stop it, if applied.
Now, I'm not crazy about requesting all current and future IPR Petitions put on hold, until the decision on constitutionality. This just delays any offers another year or so.
IMHO