Nobody should argue that the show is accurate to the source material. However, this article hides behind a veil of "fact" to really just complain about the things they don't like the show. There are huge gaps of knowledge about what is happening in the Second Age so there are all kinds of things that could be happening (elves watching mordor? Maybe. Elrond buddy-buddy with the Dwarves? He had to learn Khuzdul somehow.) but the article cherry picks what it likes and what it doesn't, complaining about there being no evidence of some things while saying that the lack of information about other events is okay because they like the outcome.

Assumptions made about what the Elves could have been doing during this time period in Eregion? The author makes them sound absurd and completely outside of what was written. Whatever the Harfoots are doing? That's okay because the author likes their storyline on the show

If you don't like the show that is 100% okay, I think the show is a 7/10 at best and sometimes it dips well below that, but don't hide that distaste behind a call for literary purity.