This isn't a thing. You're entirely making this up. There is NO confusion about this whatsoever. Stop it.
Go back and read some of the posts, there's clearly confusion about what canon means. I'm not making this up.
If the confusion you're speaking of is regarding Dragon Ball's actual official canon, I don't think that the term "headcanon" has anything to do with it.
Fair enough, we can reasonably disagree about this, though I do think Adding "head" or "personal" before canon implies that it's a type of canon.
I don't know the etymology of head-cannon but I doubt its origins revolve around someone deciding to create a word that was inherently easy to understand and would allow for maximum contribution to discussion. However, at this point you could argue that the word is so ingrained that it would be more confusing to suddenly change now.
The English language is full of words that require a understanding of contex to make sense. And while arguably confusing it is way too late in the game now.
Gas Giant: A type of planet- not a giant made of gas
Watershed: place where land is split by a river- not a shed made of water, or even a shed at all.
Piecemeal: improving a process through small increments- not a fraction of a meal.
Historiography: a interpretation of events- not a blend of history and geography.
Perhaps Hypothetical Cannon would suite your tastes over Head Cannon?
Imaginery Cannon/False Cannon/make believe cannon?
You can use whatever words you find agreeable, however I think if you start using other words in place of Headcannon you will find that more
People will be confused rather than less.
Conclusion: is head-cannon a silly word- yes. Is the English language full of nonsense words that are still used professionally? Yes!!
Would it be more Confusing to change silly words into words that are more intuitive- most definitely, atleast at the beginning.
Head-cannon is just a fan's personal interpretation of cannon.
Drgaon Ball can be divided two ways.
Events that have officially happened vs events that are implied.
If cannon details the events that explicitly occurred,
Head-cannon details the events that were implied.
Is head-cannon used improperly by fans in order to change confirmed events? Yes, some individuals ignore confirmed events either from ignorance or bias.
Head cannon has no jurisdiction over confirmed events. You cant use head-cannon to argue that Hercule Satan actually defeated Cell- that's inaccurate, and officially disproved by cannon.
You can believe it, but you would be objectively wrong.
You can use head-cannon in order to argue events that haven't been proved or disproved via a lack of evidence.
Head-cannon isn't the changing of official cannon, it's the intepretetion of what what cannon doesn't explain, but implies.
Head-cannon only has degrees of being correct, by default it will never be absolute.