I wouldn't put any stock in fan-made timelines considering that the writers themselves have contradicted themselves over and over. Until someone from the dev team specifically says what year it is now, it's best to go along with what Koji said and that we're in a time bubble.

If 5 years had passed since ARR, then the twins would be 21 now, which doesn't make any sense considering there are fully grown adult elezen who are 21 according to the lore book. It's easier to assume that the writers for Bozja made a mistake or the character over-generalized than to say that the whole story has progressed a lot further than anything else would suggest.