This preamble seems to be very much along the lines of the protocol of May 5, 1988, with a few additional provisions on the relationship between Tradition and the teaching authority of the Church.
For years the long time Secretary of the Ecclesia Dei Commission, Mgr. Camille Perl, kept saying that the May 5th, 1988 Protocol was still on offer to the SSPX. I think I once read somewhere that he even said so to G.R.E.C.
The whole problem is that Bp Felliar was making out that he was obtaining some sort of sweetheart deal with Rome, when in fact it was no more than an amended version of the 1988 Protocol that Abp Lefebvre accepted on 5th May, 1988 but repudiated the very next day.