As amazing as it feels, I actually agree with several of the points that Mobius makes in that pseudo-article. Things like the Artemis D.H.'s lack of upgraded stats, the Mentu's lack of beam cannons, the Mjolnir's lack of additional small-caliber turrets, and the Iceni's ever-changing and strangely asymmetric loadout are the sort of inconsistencies that tend to jump out at you. (I'm not so much in agreement over things like the Shivans' duplication of Terran secondaries or the Orion turret.) I do think these sorts of little factoids are worth mentioning somewhere in the wiki, even in the sort of article that Mobius is proposing, though I would advise against excising as much personal opinion and/or "interpretation from source material" as possible. And as I stated previously, I'd fundamentally reject any assertion that "the game" and "the universe" are two separate quantities being written up, since that's purely a matter of personal opinion and interpretation.
As far as the overall question as to whether table stats or tech room descriptions should be given greater canonical presence, my personal feeling is that it all depends on the particular situation. For instance, the Artemis D.H. being explicitly listed as a special-ops bomber with enhanced capabilities yet playing like a reskinned Artemis would have me come down on the side of the tech description, since having it play identical to the original would serve no purpose at all from a development perspective; if I had to guess outright, I'd say that someone just forgot to tweak its table stats before the game was released. In contrast, for something like the Orion's assignment of a BGreen to that three-barreled turret, I'd come down squarely on the side of the tables despite the visual oddity, since the Orion's powerful anti-capship armaments are the backbone of its presence and effectiveness in FS2. Overall, like NGTM-1R mentioned, the FS universe exists solely for the purposes of gameplay, so when there's any doubt, I think one should try to err on the side of what we actually see in-mission.