Grin! I didn’t say it was absolutely correct; it was my vote for a statement to be made absolutely correct by whatever magical fiat the OP proposes.
(I live in fear for the future fate of white chocolate! I have lived through the demise of Royal Crown cola and Aspen apple soda. Never again!)
I’m in a quandary. I don’t believe there is an eternal afterlife in Heaven where good people go when they die. But I’d delighted to be wrong.
So can I declare I believe in Heaven even if I don’t and force it into existence?
Reading the OP carefully, your selection of “There is a Heaven for good people” wouldn’t make that true; only authoritative and correct and prevailing in the view of all people. Everyone would believe it to be true.
It might be a better world…
Here’s one from me: “Creative” spellings of names are undesirable and should be prevented wherever possible.
I might break your machine with a paradox, but honestly before I thought of that ramification the first thing that came to mind was,
“Everyone should tolerate opinions other than their own.”
… whereas I am embracing the paradox on purpose:
“No opinion on any subject may ever be deemed absolutely correct and authoritative”.

I am almost dripping with sexual attraction to women, but they won’t tell me so. But all I have to do is tell the women I want that I want them, and they will have hot monkey sex with me whenever and wherever I want.
I think that counts as an opnion – it certainly isn’t a fact!
Boyo Jim: Interesting example. It comes very close to changing the facts in the world, rather than just establishing an opinion.
As a blunter example, suppose I used the magic of the OP to be able to fly. Everyone on earth would believe I can fly. I can say, “Well, I was just flying over Iowa today, chasing tornadoes,” and everyone would accept that as true.
But it wouldn’t actually mean I can fly!