Is it the true credit roll, though? The game itself says in the final image after the first credits "To be continued..." to signify more content. Several games have content beyond a credits roll that triggers another credits roll when completed and is included in the any% timing of the run. Diddy Kong Racing and Pokemon Gold/Silver come to mind. This is no different.
I noticed that the SDA run of this game has not been posted here and it appears to be faster than any of these times. I wanted to add the time myself, but I cannot submit it.
http://speeddemosarchive.com/MarioTennisPowerTour.html
This is any% singles. I measured the real-time as a 1:13:45, IGT 1:14:55.
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Actually, new submissions have always required video. A lot of times were imported, presumably from PBTracker or something like that, before I even knew that these leaderboards existed, but I haven't had the heart or the pressure to remove them.
Unfortunately, the only good way to prove that times are legitimate are through video of those times happening. I may have Tweeted a picture of me improving my Intense mode time by 54 seconds, but there's no way in hell I would update my time because I can't actually show what I did to get that time. Quite frankly, I don't see the point of allowing runs without a record of them happening, not just a record that they happened.
We will probably always require video for runs and, at some point, I will probably get videos of the times that don't have them and delete the rest.