What's the ruling regarding SNES emulators for this game?

I believe Bizhawk and SNES9X are the go to emus in terms of accuracy. Those two are the most recommended to run.

Same as the rules for Super Metroid: https://wiki.speedga.me/Leaderboard_Submission_Rules

You may also use the MiSTer FPGA if you happen to have one of those.