I totally agree that the Orthodox are watching closely. But they are not all watching closely for the same reasons.
I am not sure what “ultra-ecumenical” means in the Orthodox context

…but the Orthodox who want communion with their Catholic sister churches from whom they are now separated are not going to view the reproachment with the SSPX as a positive sign since the ecclesiology and vision of the Church represented by that group would make communion between Melkites and Antiochenes more difficult. Vatican2 was seen as a very positive step by most of those groups. *.
Just, btw, I suspect the reaction would be different than the one I experienced in an Antiochene parish that was more dominated by converts from Evangelicalism too. But that is not the demographic makeup of the parish I know, nor do I have much experience with those parishes. The parish I know is mostly cradle-Orthodox.
It is easy for the Moscow Patriarch on the other hand, or members of the old ROCOR, to see this as a positive move because they have no vaguely-near-term interest whatsoever in communion with Rome or some Eastern Catholic Church to which they are related (in fact Moscow is working its butt off to make sure such a communion does not come to fruition in the Ukraine). They see Rome, then, as securing a cultural boundary against modernity
spit on the ground here. I think the same thing can be said about the Orthodox Jewish Rabbi who spoke out in favor of Rome mending fences with the SSPX. They are looking for practical allies in a culture war, not doctrinal commonality.
And this is why you will see a range of reactions from within Orthodoxy, I suspect.
I recognize that everything I am reporting is anecdotal, but so is the report of one French-Russian priest. It is just my suspicion that the range of responses are fairly broad, and depend on which Orthodox group you poll.
salaam.
p.s. 2007 is the correct date for the ROCOR returning to communion with their Patriarch. And it was a wonderful day. Ya Salaam!*