And getting back to the infinite nature of the big mega super duper universe, such AI would, by definition, exist in infinite numbers, but it would also perhaps exist in denser numbers, more AI hot rods per universe, whereas actual life capable of traveling hundreds of thousand, millions, of light years (and through various wimpy big bang universes) would be far less common, although still infinite in total.

Wrong. There is no total in infinity. There are only patterns. AI might be observed more frequently in this pattern while intelligent biological life as we know it less frequently.