They are not allowed, we state in the rules that runs can't be on everdrive or flashcarts, which is what repros are.
Pro tip @JacksonPlayz theres a link thats in the rejection note when your run gets rejected. Its getting rejected because there is milliseconds in the submission. Just remove those and it will go through the bot.
https://sites.google.com/view/supermario64/singlestar/records
The single star records can be found here. They were moved for a couple of reasons, but essentially it was mainly moved because the leaderboard format didn't exactly fit the information people wanted conveyed. This site has much more info on WR progression of the stars, potential strat improvements, ideal times, and of course the current records (both real time and IGT).
The spreadsheet found on that page is also linked at the top of the Resources tab on SRC.