Unless I am mistaken, other packages have been removed for the same reason.
Request #40863 and
Request #37171 to name two of them.
I believe it also states in the
FAQ of the AUR wiki page that everything is allowed **as long as you are in compliance with the licensing terms of the content.** Which this package, among other packages submitted for review today definitely do not follow the Licensing terms of Minecraft.
I believe I'm missing what about the AUR would make this among other packages submitted today fine, but the two I have previously brought up not fine.