ClarkAre there any other exploits that could be used in comp that still haven't been fixed?
There definitely are but on what scale, I could not tell you. I don't think it would be a good idea to list really bad ones I do know about on a public forum as it would just make bad actors aware of their existence (most are to troll spies or bypass sv_pure restrictions which is not stuff I want to spell out to everyone how to do). It's a good practice to just check that issue tracker sometimes if you think there is something that you cannot explain, I merely typed "dalokohs" on the issues and it was one of the first things to pop up. A lot of the weird demoknight exploits/quirks are also mentioned there, to list a few:
https://github.com/ValveSoftware/Source-1-Games/issues/3254
https://github.com/ValveSoftware/Source-1-Games/issues/4922
I am sure you could find more if you just type "demoknight" and start reading.
The issue with a lot of these YouTube clips is that they would hold far more weight as evidence if people still had the demos (first person or STV) for them as the demos show recorded console commands & inputs, can be slowed/sped up if needed and you can enable outlines to see what other players were doing/if he is locking on to stuff through walls etc. This is definitely more on ETF2L than the players due to the data loss, but it's not like many of the current AC admins can really do much about that either to re-evaluate any of these in a proper fashion. As far as I can tell some of the clips you posted are not from officials either but from scrims and maybe even the occasional pug, so they never would have been uploaded to ETF2L in the first place. The game having changed several times over the years and breaking old demos on the modern 64-bit build does not help with investigating, but it should still be possible even if it means downloading some shady back-up of TF2 from someone who did not auto-update his game since 2020-ish.
I don't think this one was posted before (sorry if so) but might as well add to the pile of ancient clips:
https://www.youtube.com/watch?v=c6aejYlUsIU
This was from HLPugs.tf era and while the clip itself is definitely out there, the demo itself is from 2019 and when I asked one of the admins from the pug site back then about it, it was (unsurprisingly) lost to time.
He has uploaded somewhere in the ballpark of 40-50 demos to ETF2L now that are still up across both 6s and HL; if all that was found in the uploaded demos from his officials after years of requesting his demos on both Heavy and Demoknight is an interp exploit discovered during a routine check (not even a report) and a ban for a demoknight related script which was overturned within the day, I fear a lot of these 10-30 second clips won't be considered evidence by ETF2L no matter how sketchy they look unless the demos themselves can somehow be found, played back after all these years and they are included in a report.