Having a years old steam account with a clean record then getting flagged as a cheater must suck when you weren't even trying to cheat. Even if Valve plans to reverse it your account potentially not getting reversed would be a tough pill to swallow during the wait. Shitty situation.
Reminds me of the early days of PUBG, when they started banning people for using Reshade. Instead of, you know, fixing the blurry, desaturated graphics. They eventually added a sharpening setting but to this day the game still looks dull, which makes enemies hard to spot in a game that heavily relies on being able to see.