The reason why TotalFinder appears to have suddenly started working on Apple Silicon for you guys is because I released TotalFinder 1.14.1 about 2 weeks ago, which has Apple Silicon support — you must have happened to have tried using TotalFinder again after that period of time ;P
Also, the general discussion thread for that can be found here, if either of you are interested.
I’m glad you’re happy with it and that it’s working for you! Feel free to report any issues you may encounter in the thread I linked above〜