This is the last short I've got to stall for time until the Mebius video. Thank you for being patient. This is also the first and last time I use Premiere's auto captions, it's much less flexible than what I was doing with text graphics despite being made to speed up the subtitling process, lol.
I always interpreted it as the vision telling of a monster whose threat matches that of King Ghidorah. Basically to imply that Mechagodzilla is a Ghidorah-level threat.
Weird how sometimes Ghidorah is connected to MechaGodzilla in some way, here he is in a vision, in the heisei timeline Mecha King Ghidorah was used to make MechaGodzilla, and in the monsterverse it's a ghost in the machine scenario