I have no idea on why the article brags about the dungeon being bigger than Hyrule field. Compared to more recent title Hyrule field is pretty tiny. And had less to do in it than AlttP did.
People will always love to reference OoT, they are too attached to it. While I understand, as OoT is the game that I played the most in my entire life. Which I always praised as the best Zelda ever, and would always try to compare it to any other game of its genre.
Luckily, I learnt to appreciate other Zelda games, each game is its own masterpiece. Majora's Mask, The Wind Waker, Skyward Sword. I need to finish Twilight Princess, I still haven't gotten the opportunity to.
Anyway, for me now, the best Zelda games are Skyward Sword and The Wink Waker followed by Majora's Mask and Twilight Princess. But of course, OoT will always be a classic that can't be forgotten by many people, cinluding myself.
I think they also like to compare the size of things to Hyrule Field from OoT because every Zelda fan know its full size by heart, and can work as a "universal ruler" for Zelda games. Bah, I don't know.