Should we try to just cheat to get it and see what happens?
Which I did. You get to the point when the call is made, he threatens you without kidnapping Evander, you run out of town. Evander, Soren and Chuck try to contact you but you ignore them and resign to Tad via email. No unlocks
You are right of course that it definitely looks bugged. There are no purity decisions between Starface meeting and after party meeting so you can move your Purity below 10 and enable Retired without cheating.