It’s good practice to always check the rules before doing a run of any game to avoid issues like this in the future.
A moderator rejecting a run for a game modification seems pretty standard, I'd say.
"The sunglasses mod is forbidden (all mods are as well, just to be clear.) and the screen is cut incorrectly we can't even see the sprint bar."
Was the rejection reason; so it wasn't simply the sunglasses modification, but the cropping of the screen by the sounds of it. Which by comparison, does seem to cut a fairly decent chunk of the game feed from view.
Also, here: https://www.speedrun.com/tr3/forum -- I really wish people would stop using the 'The Site' general forum for stuff of this nature.
EDIT: Additionally, do not submit other user's runs as your own: https://www.speedrun.com/tr2/run/yo41gn1m