Because if not, why are they on the leaderboards?

While several games I've seen list (official) digital re-releases and backwards compatibility as part of the list of consoles you can play them on, I've also seen some games ignore the fact that you can play Wii games on the Wii U through backwards compatibility rather than just through digital re-releases. Is there a reason for that? I don't know where else to put this.

I noticed that Pikmin 1's All Parts leaderboards separate GameCube and Wii runs.

I'm asking because there doesn't appear to be a glitchless category even on the category extensions.

With all these games (this one included), I've been wondering why world record times are faster in single player. Is there an exploited glitch in all of them that doesn't work when there are just two playable characters and both are consistently controlled by human players? Yes, I know at least some of these games allow one player to use two controllers, but I doubt one person controls two characters throughout the whole run.

Doing math to find out how many Shines are intended to be the minimum you need to beat the game, I arrived at 49. There's the one at Delfino Airstrip, Shines 2-7 of Bianco Hills (the developers let you skip the first Shine, though an NPC asks if you're getting ahead of yourself if you go for Shine 2 while in Shine 1, and Shines 1-7 of all the rest of the courses. I know you can use glitches to get the Watermelon Festival early, but if you decide not to do that, I think 49 is the minimum because Episode 7 of every level is all you need to get to unlock Corona Mountain, a name that aged poorly.

So why doesn't anyone do 49 Shine speedruns of the game? Or call them 50 Shine speedruns if the one in Corona Mountain counts?