Yes, it uses a wall wart, and, yes, you can use one of those short extensions.
If the only problem your X900E has with the OSSC is SNES, and you don’t have or don’t care about using a SNES, then you’re probably fine; otherwise, I expect that compatibility issue would likely be fixed with a dejitter mod installed in the SNES. If you don’t already have a dejitter mod installed, I recommend installing one of these combination dejitter and RGB bypass boards.
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