PSA's been an AD, yes, but:
He's also one of the Jabber folk, and indeed Executive Director of the XSF.
So given these two statements are in conflict, there must be a problem with them.
I think it's in the implication that the XMPP folk came and looked at the IETF and decided there was some structural problem. I don't think that's the case. You'd need to ask someone who was there when it formed, like Peter, but I suspect it really mutated gradually from an umbrella organization for open-source software projects, and by the time anyone realised it was an SDO, then the IETF was already committed to SIP/SIMPLE (to the point of giving them their own area), and was in addition happy to cite XEPs and use the technology operationally.
Dave.