This is not surprising, and I am not agreeing or disagreeing.  But, I will say, this filial correction has gotten a lot of attention in the NO.  In the latest national catholic register there were two articles long articles about it.  And, I think raymond arroyo has been talking about it.  And, I wouldn't be surprised if this type of reasoning was in the mind of +Fellay and perhaps some of the other intellectuals to a certain degree.  Would they have followed that line of concern and withheld their signature, would this filial correction be as big of news as it is?  And, is a filial correction in essence good(yes)?  I have not read the filial correction, so I cannot comment as to whether it can be signed, but if we are simply referring to quoting the conservative quotes from V2 and post V2 popes, then I really am not interested in condemning that.  It does not constitute formal acceptance, and is therefore not evil.  

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I expect that Atila S. Guimarães has it right and the signatories of the correction should be addressing the errors of the other post-Vat.II popes too, and should not be basing their argument on the Vat.II docuмents. 
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And then I wonder:  If they had done that, would their correction even see the light of day?
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Perhaps it was a stretch for +Fellay to sign it, but if he had NOT signed it, would that have been better? 
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What seems to me to be most noteworthy about this correction is that all the supporters of it were able to put their heads together and make some move in the generally proper direction of calling to task the hierarchy for committing doctrinal errors and presuming everyone would follow.
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Because that is EXACTLY what happened at Vat.II only there was no well-organized opposition. Curiously, there was a sort of whimper of an opposition, but that was shut down by the liberal iron fist of door-and-window slamming, and they all went home. End of story.
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What seems to me to be most noteworthy about this correction is that all the supporters of it were able to put their heads together and make some move in the generally proper direction of calling to task the hierarchy for committing doctrinal errors and presuming everyone would follow.
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Because that is EXACTLY what happened at Vat.II only there was no well-organized opposition. Curiously, there was a sort of whimper of an opposition, but that was shut down by the liberal iron fist of door-and-window slamming, and they all went home. End of story..

The opposition against the progressivist at Vatican II, called  Coetus Internationalis Patrum , was much larger, better organized and much longer lived than this Dubia False Right. There is no comparison, this Dubia False Right is already dying out.