Both titles in question were C&Ded on copyright infringement grounds, and both titles used actual Nintendo created assets within them.
Neither titles contested the C&D, so both titles are legally the same as pirated software - namely copyright infringing works.
There are organisations such as the
EFF who specifically assist in cases where IP owners are over reaching, but it would be extremely difficult to declare either of these fanworks as anything other than derivative works, and the creators themselves have not made any attempt to push back on these C&Ds or make any claims as to fair use or transformative properties.
This topic assumes that Nintendo are actively attempting to stifle discussion, and are in some way strong arming, blackmailing, or threatening the awards in some way to prevent these titles inclusion, when it is just as likely this was decided by the awards organisation themselves that they do not want to promote illegitimate works, even if the voters decide they don't care about IP protections.
If something like PSO:BB was nominated - a cracked demo providing full game functionality, or WOW Vanilla Servers - reverse engineered privately hosted servers bypassing Blizzards commercial interests were nominated, I would also expect those titles to be delisted by the organisers just for reasons of awards show legitimacy, without any necessity of sponsors threatening to withdraw.
