They are not irrilevant at all... Codex are maded to show the setting... So what is in the codex should be seen also in the game... now Dragon age have 2 main problems in it..
1) They changed so much from origin to inquisition that some things are in directly conflict on what was written in the pervious title...I used elves and qunari as an example but there are other huge consistency problems...When you write the lore of a race and with the sequel you change totally how a race looks this is a huge continuity problem pretty much similiar to The elder scrolls when i morrowind lore claimed that cyrodill was a jungle and then released oblivion as a general europen looking place add an explanation only after... This things should be avoided to keep the lory consistent..
2) Again they can write all they want in the codex but if you describe a dark setting in the codex and you make the world in game appear like a shiny disneyworld avoiding all the controversial matter for the sake of politically correct why bother even to write a codex? (the iron bull and sten matter on female fighters for example..)
The fact that they changed the way elves look in a way that most players (myself included) don't like is irrelevant to the way they're described in the codex and in universe. It's just an unfortunate stylistic change, but no different from the way the appearance of things have changed, for example, from TW1-TW3.
With regard to the second point - this is a mischaracterization that falls apart the second you think it through. The qunari are an entire civilization, and despite whatever happens to be written in the Tome of Koslun, it will inevitably take all kinds. Do you really think you'll learn everything there is to know about them from one particularly dogmatic individual and the 30 or fewer lines of dialogue he has on the subject?
Say I'm a space alien conducting a survey on earth religions. I want to learn about the catholic church. I talk to a disinterested Christmas/Easter college student and an Opus Dei nutjob. I'm going to get an extremely divergent picture of the faith from those two people, right? Sten, and the Arishok, and Tallis, and Bull - all of these characters provide different perspectives on that religion. In my mind, that aids in verisimilitude. It makes the whole thing more consistent, more believable.
And if you're truly hung up on Krem, well... you're tying yourself into knots based on your own (unflattering, if I may say) real life opinions on the subject. You may not like it personally, but inconsistent it ain't.
I get what he is saying totally and understand the point. But I think its maybe because English is also not my first language.
Anyway, he's just stating his opinion that's not always true for others, but it is to him or her 
Meh, my leading comment to her was a cheap shot, so I took it down.
That said, it's not presented as an opinion, and I hold that it's verifiably incorrect.