From the OP:
"Fellay, Fr. Couture and the other well-known FSSPX members are or were part of the association of "Priest-Friends"? Does Mons Fellay still believe Madame Rossiniere? Is the FSSPX walking towards ѕυιcιdє because of a diabolical illusion?"
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They may be unfit but they are influential and perhaps part of an inner circle. Besides they hold the ultimate WMD. The TLM. Cross them and you lose the TLM.
A couple points to reflect upon:
1) The Rossiniere "visions" were gaining official support from Fellay as Superior general at exactly the same time that the "discreet but not secret" GREC talks were transpiring.
2) The "visions" provided the supernatural justification for embarking upon this path; the GREC talks represented the practical implementation.
3) Note the harmony between the Rossiniere vision (i.e., The SSPX will save the Church and restore Tradition), and the GREC solution (i.e., a practical accord), which again, were both transpiring at the same time.
4) Related to this: The "priest-friends" were the proto-accordistas (many of their number would later become militant supporters of a practical accord).
5) Fr. Denis Puga's 1998 Econe refutation (above) mentions that Rossiniere's "priest-friends" represented a 5th column of infiltrators within the SSPX, and that their presence would lay the seeds of division within the Society. 2012 proved him right.