TF2 literally has a built in recorder that you can set to only record tournament matches and you have to do nothing else. Putting yourself in the situation with 4 previous failures is like almost intentional with how hard you have to try to not do it.
And the ringer situation is annoying, but you as a team are responsible for the people you bring in. If the rule was different, I could bring in a guy walling his ass off and if he gets caught, I would face no repercussions despite knowingly playing with this dude. I obviously don't think you were trying to do anything scummy, but you have to treat everyone the same.