That's an interesting idea, but for a variety of reasons I'm fairly sure that Tim won't do that. Particularly not without a legal defense fund or some pro bono legal services secured to back it, but also because his vibe on it largely is "I've been called worse by better".
edit: Probably also hard to do since the CoC WG post with all the allegations on it were against an unnamed developer, making it at least an uphill battle.
Defamation doesnt require you to name the person, only for it to be obvious to a relevant reader who it is. The fact we're all talking about Tim kinda resolves that problem on the face of it.
Whether he sues or not is less important than the PSF needing to realise what crazy liability they face for their WG posting defamation this extreme against a person.
edit: Probably also hard to do since the CoC WG post with all the allegations on it were against an unnamed developer, making it at least an uphill battle.