I predicted and still predict a last-minute counter that 'but deleting should be available and instead altered so that Mods can see the previous version'.
Okay, this has 2 counter-angles:
Angle 1) The mods are self-professed laissez-faire meaning that they only tend to react to things if others than themselves report it, by removing it from view and not even marking that it's been edited, it will reduce the chance of people getting caught (so I am then altering my 'editing' to become that even normal users can see previous versions of what's edited, which truly holds the user to what they post no matter what they alter later on and increases likelihood of toxic or otherwise CoC violating posts to be dealt with).
Angle 2) The voter may not inherently be CoC-violating but instead be poor at voting. They may want or need encouragement and suggestions how to improve but be so insecure that they keep deleting the vote over and over out of lack of assurance. It's better to 'trap them' and then deal with their reasons for voting as are/were in a way that they explicitly will learn how to improve.