The screen showing the number hint was removed from the game in the 2019 game update.
Prior to that, players did not always see the number '222' on the screen above the injured Villein alien in Maray.
Support received many reports about this bug, but the number not appearing on the screen was not consistently reproducible by Cyan's QA team, or by the players reporting it, to enable developers to create a fix for the issue.
Subtle hints from the Mayor Josef's behavior throughout the game already existed in the game, allowing attentive players to consider checking the Mayor's cryopod, listed in the journal on the table in the same Maray room the alien is in.
Checking that pod is what enables that final door to open in Maray.
Removing the screen hint to allow players to focus on the more subtle path was decided as the best resolution to the problem (and is the solution that would not break the game even further).
Some walkthroughs still say players should see the screen light up and show the number, but this will not happen in any Obduction builds for any format (PC, Mac, PS4, Xbox) post-2019.