Yeah. I was very iffy on the notion of a separate Earth-1970; what got me to accept it is that DDC#12 mentioned that 2020 will feature a change to the Metaverse caused by an incursion by the old gods. And even there, I want really on board with the idea until I realized that the arrival of the New Gods at the start of the Bronze Age could be thought of as a singular event: Apokalypse has invaded other realities since then, most recently at the start of the New 52; but this was the first time they ever did so.