After reading the article again, I realized what this thing is.
It's just a really bad MMO.
That's it. That's all it can be. Because in any given adventure the PCs have to go into the dungeon and kick down every single door and kill every monster and grab every piece of loot. If they don't, they're missing out on levels and loot that supposedly convert to real-world value.
What if the group finds a way to sneak past the ogres in one area?
Unacceptable. Leaving money (XP) on the table.
What if they made a deal with the head priest of the temple of the snake god, for inside info about a totally different, more lucrative dungeon to raid, in exchange for leaving this one early?
Again, that's leaving money on the table, and also the DM can't improvise basically anything, because the amount of XP and loot that's available has to be finite and carefully monitored, or else all tables wouldn't be balanced, and DMs would be able to make it rain on their groups, or at the very least go easy, likely for a cut of the profits.
So the DM isn't really a DM, but a dealer at a casino, bound by similar rules, with their own paid position on the line.
That means there are no story hooks, no surprise narrative branches, no creativity, no incentive to roleplay (we are on the clock here, people!), no alternate interpretations of spells or magic weapons or monster powers.
It's an MMO with no graphics, incredibly slow combats, but worst of all, everything comes with the stink and panic of making money. You couldn't come up with a more nightmarish take on railroading if you tried.