Opinions aren't facts

Correct.

they don't need to be backed up

Ohhhhh no buddy. Not at all. Your opinions should ALL be backed up.

The sky is blue is a verifiable fact.

Hitler was an okay guy...that's an opinion. It should be backed up.

If you have an opinion and find out it isn't backed up by anything? Drop it.

It's not provable either way.

Great? I have no idea why you are leaping to this "unless it can be proven beyond the shadow of a doubt my opinion is okay" as though it is a tenable position. Your opinion holds 0 water. The counter opinion holds a ton of water. you don't get to pretend that since neither can ever be 100% proven that they are both equal.

All you have actually done is set up an impossible imaginary standard that can't be achieved so that you never have to re-evaluate your opinion. That's not gonna fly, sorry.

So, going all the way back to the very first sentence I said to you:

"Where does it say it was retroactively done?"

Because you said:

Don't just retroactively add it as a garnish.

Back it up. Or let it go. Or leave. Or keep trying to pivot. Any way you want to go, I'll help you out.