There are a number of other (more modern) recordings of the Lizst transcriptions of Beethoven symphonies, including some complete cycles of the nine symphonies, that recording must be from one of them. It seems to me that, if there was additional recordings, they would surely be mentioned in this context, so I'm convinced that the attribution to Gould of the 7th recording in the referenced youtube link is incorrect. Our expert panel in a dozen different countries has. Seventh symphony, opus 92 (part 3 previous 2 parts here and here). Beethoven completed the Seventh Symphony in 1812, after more than three years had passed since his Fifth and Sixth Symphonies were published in 1808. (The recording will be issued as part of the Glenn Gould Edition, SMK 52637.) Six weeks later, however, when he was due to record the work for Columbia, he broke off the taping sessions after the first movement, which then - in addition to various other recording projects yet unfinished - was not issued until 1980 as part of the Silver Jubilee Album. Welcome to the 80th work in the Slipped Disc/Idagio Beethoven Edition. It is uncertain whether Gould actually intended to gradually record the Liszt transcriptions of the eight other Beethoven symphonies, though five months after the completion of the Fifth (on June 11, 1968), he played the complete Sixth Symphony, the Pastoral, in a CBC (Canadian Broadcasting Corporation) recital. The liner notes to a CD edition of the 5th and 1st movement of the 6th explain:

I have not found authoritative sources explicitly saying there were no other recordings, but all references I know point to Gould only having recorded the 5th and the 6th.

Beethoven 7th symphony youtube