To be clear, there is one section in the lower bowl for visiting fans and one section in the upper bowl for visiting fans. This is true for every opponent that visits Heinz/Acrisure, all visiting schools are offered those same sets of tickets. There is even sometimes a 2nd visiting section added in the upper bowl to meet visitor demand. Also, there is more seats in the lower bowl visiting section than just what was accepted for the band, those lower bowl seats could have been sold to TENN fans.
So, I have no idea what the backstory or is why your AD didn't provide these tickets for TENN fans. Also, Acrisure Stadium is not exactly the LA Coliseum or Neyland, it is an 'intimate' 68K capacity stadium build in the last 20ish years, with great sight lines. There really aren't bad seats. I have sat in the upper bowl/500 sections for many Steelers games and it is fine enough.