The following is not a question: Can something come from nothing?

[Rampant.A.I.]

You have clearly not understood what a singularity is.
Don't worry, it's normal not to understand it... it is a difficult concept, as it is a warping of space-time, turning these into something beyond our intuitive understanding of both time and space.
I can only tell you that what you wrote makes no sense. It's sort of like saying "if the square has round sides,".

It's my understanding that the laws of nature came about just after the big bang, so I doubt that anyone can say they understand the nature of the universe prior to the big bang.

This after countless "first cause" arguments where AM claimed the exact opposite.

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Again, keep in mind that "eternal existence" would require time and time is not a guaranteed to exist at this stage.
Also, multidimensional time may exist out of the known universe, which can bring about some weird stuff. I can't think about it, I cannot wrap my head around 2-D time, but, at this stage, it can't be dismissed. This sort of thing is what I mean by "the rules we know of" breaking down.
Virtually anything is possible.

As those go beyond (or outside or whatever) the laws of nature, they're appeals to supernatural explanations.

"We don't know, anything is possible" is not an appeal to a supernatural explanation.