More to the point, there's no evidence in the entire history of this thread that QSC has ever supplied a fake compound to anyone.
There have been a few quality mishaps that were addressed for the most part, the most recent of which was a batch of semaglutide that wasn't buffered correctly was replaced by the vendor. Even though it was still very high purity, but would likely degrade more quickly.
Tirzepatide ranks among the most popular peptides QSC sells. it's been tested rigorously and repeatedly by both the vendor and others. The likelihood that it's "fake" is pretty small.