No, it doesn't. That's your doctrine being read into the text. The fact is that it teaches the opposite of your doctrine, which we'll get to in a moment.
You did, however, use the correct term when you said that God "
predicts the end from the beginning". Everything after that was just your doctrine and not what the passage teaches at all. Indeed, that doctrine isn't only absent from Isaiah 46:10, it's absent from the whole of scripture. The bible very simply does not teach anything so transparently self-contractictory as "He (God) dwells in the end and the beginning at the same time."
Don't minimize it. It isn't hard to comprehend, it is entirely impossible to comprehend because it is irrational in the extreme. God Himself could not comprehend it. It would be like trying to imagine a color without light or a sphere with sharp corners. It cannot be done because it is a contradiction.
The concept of timeless existence is, in fact, one of the best examples of a stolen concept fallacy that anyone could come up with. A stolen concept fallacy occurs when a concept is employed that is based on another concept that is being denied. A more obvious example is the statement, "All private property is theft." The statement "steals the concept" of theft by seeking to undermine the concept of private property which the concept of "theft" is logical predicated on. The statement is therefore self-contradictory and therefore false.
The idea of timeless existence steals the concept of existence because existence has no meaning outside of time. Time is not a thing, it is an idea. Time is a convention of language used to communicate information related to the duration and sequence of events. It cannot be existed outside of because the concept of existence implies the concept of duration and duration is all time is. Therefore, the idea of timeless existence steals the concept of existence because the denial of time (duration) renders existence meaningless. It is a self-contradiction and is therefore a self defeating falsehood.
It is a good thing that the bible does not teach it. If it did, it would, by itself, falsify the whole of Christianity and both Judaism and Islam as well for that matter.
Why? Why couldn't that be true? Because you said so?
It doesn't teach that a thousands years IS a single day or that a single day IS a thousand years. It simply likens one to the other. How would an infinite amount of time and a God who is outstandingly patient not be able to reasonably liken a thousand years to a single day when compared to the tiny time scales we mere mortals are used to dealing with? It sounds perfectly reasonable to me.
There is no passage of the bible that says anything similar to "God exists outside of time." In fact, the concept of timelessness is entirely foreign to the bible altogether, never mind in relation to God. The only reason you believe it is because Augustine of Hippo imported the concept into Catholicism from the Classics (i.e. Aristotle and Plato) and it survived the Reformation fully intact because Luther, an Augustinian monk, broke from Rome, not Greece.
There's much more to say but I'm out of time! (See what I did there?
Clete