you have to remember, the rumormonger HIMSELF admits that he's scamming us, and that at least a few of these are either outright lies, or things that are only true in other timelines. now, with that in mind:
the nifaria one is, of course, a lie.
infernal, fairwind, etc. we don't know, it could be true, a lie, or something from another timeline.
celestia pushing up daisies is saying that she's dead, and "don't trust the flower" is an unrelated one in reference to flowey from undertale.
this could be either a lie, or in reference to riadne's son, tomix jr. having children in the future.
innanitas is one of the forums AK's, as well as a volunteer worker on the DF team(like san robin).
i can't help you with the zapp one, as i never finished that questline in popsprocket.
not sure who belle is, either.
xan becoming an infernal is another wildcard, and one that might end up going unsolved.
"he rides on the morrow" may or may not be generic foreshadowing of....something.
as is "word of the prophets".
konnan maturing and becoming an good big brother is the same as nifaria, since all of his family(including his little sister) died when akriloth destroyed his village.
not sure about "it likes to play with you".
also not sure about the elysium warden one.
san robin being a spy is most likely the same as konnan and nifaria, being a lie.
seven five five is probably a code that we might need to remember for something.
seven heroes is probably something to do with the six heroes saga.
the head and heart one... i got nothing.
abel, also nothing.