This is a current model DMM - Keysight are still selling them...
...which begs the question: Are they still selling DMMs with rubbish OLED displays?
One would HOPE that the current stock (and replacement displays) are longer life that the original stuff...
The display manufacturer may not have improved their processes or equipment however, so current production may still be the same as when they first were available for sale to Escort.
Even if this is the case, I get your anger/frustration as they should have sought out an improved OLED for it or EOL'ed that particular model. Personally, I suspect greed is the reason why nothing has been done.
Not ideal of course, but you can at least replace the display and get it working again (linked thread has the P/N & sources to obtain one).
For disclosure I own an Agilent labelled U1252B.
Perhaps replacing the OLED, selling it, and replacing it with a different meter would be worth it in order to eliminate any further aggravation over this issue.