About a week ago, I submitted a Pre-1.16, All Swords SSG speedrun of 29.51 seconds. I just got a notification saying the run was rejected by the_yuukster, with the reason, "The launcher/client used to run the game is not allowed. Please use vanilla alternatives, such as the main Minecraft launcher or MultiMC." However, I DID use MultiMC for my speedrun. I was playing Minecraft 1.15.1 with Fabric (no Fabric API), and the mods Lithium, Set Spawn, and LazyDFU. I showed my debug screen at the end for a fraction of a second, and I really do not understand what in my debug screen would have indicated that I used an illegal launcher, even though I didn't.
Can anyone explain or clarify this?

The run https://www.speedrun.com/mcce/run/zpgql7xz

yes, it's that one.

Hi Austminer, I'm sorry for rejecting the run, it is back in the queue. There are some discrepancies with how the game looks between 1.15.1 and 1.15.2 that I wasn't aware of, that made me think it was ran on a non-approved launcher. Thank you for creating this thread to rectify the mistake.