Has he publicly red-lighted attendance at Neo-SSPX, Sedevacantist, and Indult Masses yet?

Yes, I don't see any reason to red-light any of these groups, as groups ... except potentially on a case-by-case basis (don't go to this or that priest or "priest" or chapel).  IMO, "Indult" / "Motu" / "Ecclesia Dei" are getting to close to having very few validly-ordained priests left in those groups ... but you will occasionally find an SSPX-ordained refugee in one of those groups, and some of them do have Mass in the same churches where the NOM is also held ... yet there are some dedicated FSSP / ICK types of "chapels" / "parishes" (though even for these many or most have at least one or another doubtfully-ordained priest).  So perhaps Indult is closest to red-light ... and I would definitely give them a hard Orange

Yes, I'm sure +Lefebvre was making puns in English between Indult and Insult.  +Lefebvre did have different views on it over the years.

Nobody's calling it "wine", just that there are circuмstances in which one might be able to attend, thought they're getting fewer and fewer.

If there were an FSSP priest, validly orainded, say, former SSPX, in a church / chapel dedicated only to the Tridentine Mass, there's little difference between that and SSPX, and in fact there are some FSSP priests that are to the right of where neo-SSPX have gone.

I actually new of an FSSP church where the priest stationed there had been conditionally ordained in SSPX and where they exclusively used the pre-Vatican II Sacramental Rites, and even the pre-1955 Rite.

Dogmatic Resistance home-aloner...that's a new one