Is it clear when the WTBTS submitted their application? If they were accepted in 1992 then their application would have been made in 1991 (or certainly that is what the evidence from the UN suggests) which begs the question as to whether the wording was changed before the 1991 application form was released or during.
Regardless of that though I would expect any changes to the T&C's of membership to have been communicated to any existing or processing NGO. Do we know if these changes were communicated and if so how they were done so? This could make the difference between the WTBTS being hypocrites/liars or simply incompetent.
I wouldn't be surprised at either outcome....