Sodium, Lithium, and some others are allowed I believe, Iris, I don't think so, they also don't require Fabric API, but if you want to be on the safe side, check the Mod List, they have one for each version, check which version you'll be doing your run in and download the mods like from Modrinth, some aren't in Modrinth but you can also download them directly from the list: https://mods.tildejustin.dev/?version=1.16.1&run=ssg&os=windows

i had a run for full inventory almost a month ago, and it was only verified 5 days ago, it takes time for verification, so just be patient, and they'll eventually get to your run