First, one needs to define "space".
Second, mathematically, as Georg Cantor showed, infinity comes in different sizes. If space is infinite, is it just Aleph-null infinite?
I’m sure if you substitute “universe” for “space”, this is what he means.
“Space” is such a general catch-all term, it has no real meaning.
Just my take, if you will...
CA....
I have a suspicion that it is in the "beyond all understanding" category.
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Wisdom in Proverbs speaking:
25 Before the mountains were settled, before the hills was I brought forth:
26 While as yet he had not made the earth, nor the fields, nor the *highest part of the dust of the world.
{*The highest part of the dust of the world —( ראש עפרות תבל rosh aphroth tebel ), "the first particle of matter." The prima materia, the primitive atom.}