You gotta preface theses posts better if you didn't want advice or people saying "skill issue."
I only give advice because if Valve/TF2Team isn't doing anything regarding the niche scenario of kritz demos on one part of a map, what the heck makes you think any of the Skial administration will do the same?
The only somewhat notable "fix" (more of a community re-make) I've seen for these sorts of stalemates was mostly watching Shounics stuff on his 100 player server with his own rendition of pl_Dustbowl adding more options for blue offense to press the attack instead of being funneled through normal channels where most crit nades go.
But then again - that's even more of an extreme example of Dustbowl due to the massive amount of players as compared to the base 24.
Every time I've seen you within the US Dustbowl - the moment you see one of the regulars you'll usually call it out in chat in regards to krits hell incoming. "Oh look the spammer" in some variation. You're prefacing it in advance for your team already which is greatly appreciated.
To which usually is met by the kritz user in question by saying "you're bad." right back at you.
"Kritz Demo is hard to deal with - if there is a counterbalance, people would do it."
Multiple people who have used it against you or are victims with you against kritz have even mentioned methods for counteracting it in game.

If you don't even know what this is and how amazing it is versus critical damage - that's on
you. But hey come rant about it more through here and double down on other's opinions/inquiries being wrong - see what progress that gives.