We can say that nothing is definitionally non existent.
No, we can't. You keep viewing 'nothing' as some sort of lowest point - like an absolute zero in temperature measurement. In some instances, though, zero is a balance point, a centre-line between 'thing' and 'anti-thing'. Zero, in that instance, is not 'definitionally nothing'.
So something exists that has always existed since nothing comes from nothing.
Again, no.
Outrider maintains that this something is an infinite regression of causes.
No, Outrider doesn't maintain that. Outrider posits that as a possible example of a model of reality which doesn't require an 'uncaused cause'.
I say that it it is something other since caused things have a cause and the thing I proposes hasn't failed to exist and can have no external cause since nothing comes from nothing.
You just arbitrarily determine your favourite toy is 'uncaused' out of nowhere because... um... ooh, look, strawman. Quick, say 'antitheists' in the hope no-one spots the special pleading.
So although it is not caused it has an explanation.
No, it's trying to define the problem out of existence rather than actually addressing. 'God did it' has always been the avoidance of answering the question rather than an attempt to actually answer it, and 'God did God' is just the epitome of that nonsense.
Outrider says his entity doesn't have a reason but it does since an infinite regress implies that everything has a cause.
Do you bother reading what people actually write? I've expressly pointed out, in response to this assertion, that that's not what I'm saying. Each element of an infinite regress has a cause, yes, but given that there's no initiation (hence, infinite) there is no initial start point to have a 'reason' implemented, no instantiation for an overriding purpose, reason or cause to be inserted.
I would be very interested in moving to some of the secondary problems with an infinite regress if anyone is game.
Because you appreciate you've manifestly failed to address any of the primary ones, or because you have new and interesting misrepresentations waiting in the wings? Presumably created ex nihilo, obviously, just emerging spontaneously out of diefic magnanimity, because something out of nothing is impossible.
O.