NHTSA Complaint #11448999 — 2018 AUDI Q7

I recently purchased a CPO 2018 Audi Q7, and shortly after purchase, I encountered the problem indicated in this TSB about break squeal (https://static.nhtsa.gov/odi/tsbs/2018/MC-10153128-9999.pdf) I contacted the dealer (Audi North Austin, located at 12971 Pond Springs Road, Austin, TX 78729) to fix this problem, but was refused because my car does not meet the criteria specified in the TSB, namely 24 Months / 24,000 Miles (my car has 27,700 Miles). In doing so, I found another TSB (https://static.nhtsa.gov/odi/tsbs/2018/MC-10153129-9999.pdf) with the same problem as in my car. And it has different criteria, namely 48 Months/50,000 Mile. In this regard, I would like to ask why there are different criteria for the same problem? Why are 2017 Audi Q7 models has 48 Months/50,000 Miles to fix this problem, but 2018 Audi Q7 only 24 Months/24,000 Miles ?