Wow, I can't believe it. A Hirhurim commentator has just come up with a brand new version of the Nes-Nissayon (NN) Theory ! Amazing. For the sake of simplicity, I shall call it NN-V2. This new theory is way more sophisticated than NN-V1, as the author explains, NN V1 is 'childish, self-indulgent, solipsistic delusion' whereas NN-V2 is not.
In the words of the author, Euonymus Alatus :
We all know that time is subjective and does not apply to the creator. If so, creation ex nihilo clearly included the subjective future. It is equally true that the moment of creation included the past, which, nunc pro tunc, actually existed. The moment of creation, i.e., the moment that past and future came into existence, can be any point in the continuum. For all we know, we, and all of our pasts, were created a moment ago. It is only after that creation that the past exists. The Torah tells us that the moment of creation was 5765 years ago. Please don't dumb this down into "He created an old world." It is utterly different. Yeshivaleit call this "mikahn ulehabo lemafrei'a." Furthermore, see Meshech Chochmo in Breishis who brings R' Eliezer Shittah in Yoma 54b,Sotah 45b,and Rosh Hashanna 26a regarding creation of geographic, spiritual, and temporal structures from the center, not beginning or end.
If I understand this correctly, NN-V2 is not saying that G-d created a universe which simply looks old, as that would be childish. No, NN-V2 is saying that 5765 years ago, G-d created an actual 15 billion year old universe ! Not childish at all !
Unfortunately this theory doesn't explain the Mabul, or evolution, or anything else though. Still, it does preserve the notion of 5765 years, which as every man, woman and child knows, is one of the fundamental ikkarim of Yiddishkeit.
For some strange reason, the phrase 'childish, self-indulgent, solipsistic delusion' springs to mind. But I have no idea why, or what solipsistic means.