Okay; so when he spoke of a multiverse, he wasn't speaking of something real, or even something even believed to be real; he was just speaking of a hypothetical? Can you give a hypothetical of when there could be more than one "all that exists"?Pedantically, yes.
Prior to modern maths and physics discoveries, as @Speedwell mentioned, this space-time manifold is all we conceived of when we said "universe". With the advent of new information it is the convention to consider that which we can perceive (which is the same prior to modern math) as the universe and that which is hypothetical as the multiverse or metaverse or some other term.
I wouldn't get hung up on it.
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