He checked again. If we're being pedantic, 13/8 at 194.086 bpm is more accurate once you line up the more percussive elements in the middle of the track with a downbeat in the sequencer properly.
The actual tempo was probably 194 bpm, and the slight deviation has something to do with equipment or the transfer (tape speed, midi timing, whatever). Also consider the unquantised playing, slower attack times in some sounds, his gear etc. I wouldn't be surprised if a contemporary classical composer thought "You know what, no one's done a 13.1/16 piece - I bet it would be amazing. Such inspiration. Much genius", but I don't think that applies here. No reason to complicate things.
He made an mp3 with a ride cymbal doing the opening pattern throughout the track; 13/8 no tempo alterations, at 194.086 bpm, and it's pretty much spot on.
https://www.youtube.com/watch?v=dpwWYOE3Y9o&feature=kp
Are we talking about another?