I have searched and cant find any fact, just people discussing it
The reason im separating the spin offs from the game is because they are separate and just because someone decided at a later date to make supernova his limitbreak in the other games, doesnt mean that in FF7 its his limit break.
All evidence points to it being a summon, he can cast it at will, doesnt need to receive a certain amount of damage to activate it, and he also has the cast animation of a summon, in being he casts and then disappears. Like all of the characters do when casting a summon and never once do they disappear when using a limit break.
Plus the same team that made FFVII didnt work on the spin offs save for maybe one or two people

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