can the game boy player be added for a platform? it runs at the same speed and i would like to run the game on it.

There are a few ways to interpret the "platform" on speedrun.com

Some have platforms for every possible platform you can play it on. If GBP is added, then DS will be added as well, along with others.

Some have platforms for every release of the game, such as a game being released on PS2, XBOX, and GC.

It's not an oversight, and I think that the way this page is meant to be interpreted as the latter. If you run on GBP, tick the "GBA" as the platform used, as that is the cartridge you used.