I am way late on this but have a few things to add. I too have a trade outstanding with him. We ended up working out a significant trade in value, enough that I sent my package via USPS with tracking.
He had posted on 6/17 he sent his package with a tracking number. I sent mine on 6/21. Only after a couple of days without getting anything did I enter his number to find out it did not exist.
In hindsite, I should have know something was up. We had tried to put together a trade a couple months earlier but could not come to a deal. Then in May, he responds with another proposal and now has cards I have been looking for. But then he disappears for nearly 3 weeks until 6/16. We agree on 6/17, etc. Last contact with him on 6/28 regarding his move to CA.
Regarding his profile with the 91 positive, his first feedback was done on 4/4/2022, last was 6/18. So that was all built up over 2.5 months. While the profile had a lot of good feedback, it was not something that took long to build up.