"leading to some control over [the universe]"; like having access to the CK or something similar? The dream is a universe within a universe (a story), the dreamsleeve belies its underlying nature (computer-like), and Vivec found a way to manipulate it. Notice that it's never explained in detail how Vivec made the Provisional House, yet Vivec loves to talk about the things he's done. This suggests he didn't make the procedure to make the Provisional House, but rather that he found the tools in the "non-spatial space filling to capacity with mortal interaction and information, a canvas-less cartography of every single mind it has ever known" (Sermon Nineteen). Which is to say he searched the internet to find the tools used by the dreamer(s) to create the dream.
The Dreamsleeve is the internet, yes, but it is not
our internet. It is mage internet, a magic internet that was introduced and put forth in-universe in Battlespire. No fourth-wall here. You seem to be getting the stories backwards; the creation of Aurbis is a story inside the Aurbis (the Anuad), not the other way around. The Dreamsleeve doesn't belie its true nature nearly as much as the fact that Nirn's underground is a whole buncha cogs n' gears, but
that is called "Memory" and "The Wheels of Lull" for a reason; it's a mnemonic device for Anu to remember Nir, not a video game.
Also, "Simply put, as the Gods cannot know joy as mortals, their creation, so mortals may only understand the joy of Liberty by becoming the progenitors of the models that can make the jump past mortal death." In other words, game creators can't know what it's like to be game characters despite having created them; similarly, game characters can only understand their existence by attaining awareness of the computer on which they exist.
I never thought I'd say this with ES lore, but... you're taking that too metaphorically. Lorkhan can't know what it's like to be a mortal despite having created them; similarly, mortals can only become Amaranth by cutting themselves off entirely from the world in the Dreamsleeve and feeling nothing so they may dream (something Vivec
failed at with the Provisional House, by the way).
Granted, it's never explicitly phrased that the dream is a computer game, but the lore is open-ended and metaphysical enough to allow for such an interpretation. And it doesn't necessarily have to be our universe or our CK that the lore could be referring to. Also, C0DA.
Fourth wall is boring, C0DA is not an excuse to avoid a debate on such issues (if anything, it's encouragement; where canon doesn't exist, truth must be found through traditional methods of finding philosophical truth E.G debate, as opposed to "oh great Bethesda, does CHIM real?")