That still runs up against the very simple observation that assisted suicide is a criminal offence. Requiring (the commitment to) suicide as a condition for employment makes them a party to any such eventual act, which is a crime.

They blew up their only defence, which is to claim it's not meant seriously, by firing employees who refused to commit to the message of the document.

Getting fired for refusing to be the victim of a crime is... well I'm not a lawyer but I think that's pretty damning for the EF.