I feel that cheats and glitches are not "real" walkthroughs. Walkthroughs should be legit, have some form of strategy, tactics, tips instead of just mindless hacking and exploiting a game's errors. Maybe there should be a special section just for the cheats and glitches specially for people that frequent those threads? That way, people who visit the walkthroughs know that it isn't just a hack that spoils the fun of a game?
Armorgames tries to keep the sections to a minimum and keep it clean, as to make the site not too intimidating and large to make people feel as if they can grasp all the sections at once, and not have 40 sections like some forums do and feel intimidated. Things like cheats walkthroughs and hints are rightfully under once section because they are all extra info for games that you want. You can call walkthroughs cheating also, because the game isn't meant to be played with a guide walking you through, hence cheating.