Why is the resolution limited at 90hz?
There should be plenty of bandwidth to run 2x2560x2560 at 90hz. That should only be ~28.3gbps, which is less than dp 1.4 max of 32.
And it's less bandwidth than a 4k monitor at 240hz, though that requires DSC.
Everyone was that was caught was found out because they took a car and got their license plate scanned.
There was other evidence too like clothes and fingerprints, but those probably would not have been enough evidence on it's own.
Leave your phone at home, don't bring anything you don't need, don't leave any items behind, and get rid of recognizable clothing.
And keep it simple, don't draw unnecessary attention.