That's not an ad hominem, as the reports of his behavior as a guest are offered relevant to discussion of his behavior as a guest, not as dismissal of his claims to which that is irrelevant.

> as a guest

You can hardly feel as a guest anymore if you live somewhere for 7 years.

I suspect tenant/squatter's rights do not apply in embassies, but I would love to hear a lawyer's opinion on that point.

Well, first I believe that Equador’s laws would be in play here, because it’s their sovereign land. But it’s also government property, which typically has different rules than private property, presumably including areas like squatters rights.

At common law, you cannot gain title by adverse possession against the government.

However, for leaseholds, it's all going to be determined by the pertinent statutes. That's even more true for Ecuador, which - as far as I know - is not a common law country.

The real issue is that ejecting him from the embassy is, in effect, ejecting him from the sovereign territory of Ecuador. Depending on the exact basis they claimed when allowing him to stay, it could constitute refoulement of an asylee, which would violate international law.