While I agree that the NFL will never publish anything that exonerates NE, it should be pointed out that what they are doing isn't totally ridiculous.
We're all ridiculing the NFL's testing procedure because it'll fail to show the effects of the Ideal Gas Law.
But why should the NFL care about the IGL? The NFL has two reasons to not care about the IGL: (1) They only care that balls aren't tampered with after checkin, and (2) They don't want to create info that could exonerate NE.
Even if the NFL were not a bunch of NE-hating corrupt hacks, position (1) is a perfectly reasonable position to take. I see nothing wrong with saying "We don't care what the weather does to ball pressure so long as nobody screws with the balls".
Given that they're only looking for tampering then the procedure of measuring the balls indoors right after checkin and then measuring them later, indoors, after they have a chance to equilibriate, is fine. If the pressure is (within error bounds) where it was at the start -- no tampering. If it isn't, then there was likely tampering.
This is actually a nice solution, when I think about it. Back when the NFL announced they were going to crack down on ball pressure we were all wondering how they were going to deal with the balls being all sorts of different pressures depending on the on-field temp. Would they have to publish conversion charts, etc.? What they came up with is actually rather elegant. Don't worry about any of that -- just let the balls equilibriate in the same environment they were initially measured in and test them again and see if they are at their original pressures. It's a nice way to check for tampering.
That gives the NFL all the information it really needs to know. That it also will not generate any NE-exonerating info is a nice bonus for the corrupt hacks.