There is a reality so close to you that someone there could reach across and smack you, but you cannot see that realm because you were fabricated with 4D reality factors. I can prove that realm is there using scriptures, but I cannot show you that realm. Is that realm ‘real’. well, yes and no. It is real when it intersects my realm ... or Belshazzar’s realm. But if something is in that realm is it also in our realm? Can you answer that one cogently ... in 200 words or less, please?
I have not yet argued (in this thread at least) for the truth of transubstantiation. I have only argued against misinterpretations of the dogma.
Your passage is from some guy -- about whom I could find nothing -- talking about bringing Christ down and placing him on the altar.
Sed contra:The place and the object placed must be equal, as is clear from the Philosopher (Phys. iv). But the place, where this sacrament is, is much less than the body of Christ. Therefore Christ's body is not in this sacrament as in a place. [emphasis added.]So, since Aquinas is the foremost expositor of the dogma and since, further, in 1879 Leo XIII in Aeterni Patris singled out Aquinas particularly and Scholasticism generally for special honor as a "Doctor of the Church," therefor when someone writes as did the writer of your passage the kindest thing we can do is take it as some exuberantly (and misguided) figure of speech.
-- St III Q.76, A.5
I think if you can prove the realm you describe using Scripture you should write it up and make it a thread. I would be interested.
But it still wouldn't pertain to "substance" as the term is used in Aquinas or in the dogma.