MUROYA, Yasutaka “Apropos the Nyāyasūcīnibandha: Some Historical Problems and the Manuscript Transmission of the Nyāyasūtra,” Journal of the Ganganatha Jha Kendriya Sanskrit Vidyapeetha 62 (2006), pp. 405–432.
Muroya 2006:23: Under this assumption, inasmuch as the printed NSN regards the relevant relationship as upodghāta, strong doubt is throuwn upon the antiquity of the work, resulting from the alleged authorship of Vācaspati Miśra I.
I mentioned in my article, Kataoka 2014a, the disputed year "898" (976 AD according to some scholars) of Vacaspati Misra I's Nyayasucinibandha, when I discussed the chronology of Sucarita Misra in relation to Vacaspati Misra I.
But probably the consideration of the year recorded in the ms colophon is not necessary, because the Nyayasucinibandha is probably not authored by Vacaspati Misra I.
Muroya 2006 casts a doubt on the authorship, basing himself on solid evidence. I am convinced by his argument.
Under the present circumstances (unless some strong evidence pops up for his authorship), we should not take it seriously that the NSN is authored by Vacaspati Misra I. Hence we do not have to worry about the disputed date recorded in the colophon of the NSN.
What we should take into consideration as the lower limit of his date is the fact that Jnanasrimitra knows Vacaspati Misra I.
I thank Dr. Muroya for his pointing out to me the relevant material.
Correction to Kataoka 2014a:352(11), line 8 (thanks to Dr. Elisa Freschi)：