So does this mean there should be demands made that they accept religious liberty and ecumenism (for example)?
Um no, accepted without demands- as is. That is the whole point. Vatican II refused to proclaim anything in an extraordinary manner (because it couldn’t). The only problem is that of jurisdiction which can be solved by making them a personal prelature of the Pope.
If they were teaching sedevacantism or some heresy there would be a problem. They aren’t, they are just refusing to teach errors which were expounded by many/most Bishops after Vatican II.
The interesting thing is that I think it is ok for them to come in because I agree with their views on the above issues (for example).
While not being a mind reader- I think if Pope Francis allows them in it will not be because he agrees with them (he doesn’t) but because he doesn’t care about “the rules” and would see it as being merciful or “meeting them where they are at”.
Fine, sometimes people, even popes, do the right thing for the wrong reason.