I don't know. Possibly, but I have no idea.
Also, I don't know how we can hate on Oxen/Session Token when it's pretty much touted as primarily being used as a means of securing the network. Having the network 100% open is one of Tor's main weaknesses due to sybil attacks, something far less likely on Session. Plus, the onion routing aspect means your packets are fully decentralized and anonymized.
That said, I do agree that Session should have kept PFS but due to how the network works, it'd be difficult to decrypt enough messages to deanonymize.