Much of the records of match redos with freeze clause on cartridge can be seen in places like Azure Heights. There was no truly defined ruleset and many players abided by a sort of "honour" code; "house rules" if you will. But among the better players - including those who started Smogon - this was what you'd often see. Officially sanctioned play also validated this.
Oh one other thing I meant to say to you, there's an OCN discord for WCOP. I think you dont discord much or play current gens, but if you want to come by and just hang out that would be cool. I'll PM you the invite if youre keen.