"Thank you so much. I appreciate that you took the time to find this and reply to me."

Happy to help. This stuff gets super-complicated quickly. My understanding, and this comes mainly from passing conversations with other lawyers, is that it's a grey area. If they expressed a waiver clearly and expressly, as it appears here, they may have a good case that you have no inspection rights.

There is also the question of whether you have to expressly consent or not, or if, after the fact, they handed you something that said "oh, by the way, congrats on waiving your rights"