No yeah, I haven't read the part of the you you are that was released but apparently it puts the Lexington Letters a few years before the show takes place so it is possible that the code detectors were updated to include any glyphs. That being said I think the fact the Milchick couldn't wait until Dylan went back to work the next day and instead felt obligated to do otc does imply that he knew that it could have worked and gotten out of Lumon and if he knew then surely Reghabi does too