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Imho, he is saying that the Constitution does not give citizens the right to abortion (unlike what is implied in Roe vs. Wade). However, with the Constitution, we do have a way to prohibit abortion via state's rights. I also see nothing here that would disallow an amendment to the Constitution, although he didn't address that issue, probably because that would be much more difficult, but I am only guessing here.
I'm no lawyer, obviously.
Yes, that is what it sounds as though he’s saying.
And also, at the time the Constitution was written and signed, those men would never have been able to envision a time when (a) a SCOTUS would force a “right to abortion” on the country or (b) people would have become so degraded that illicit sex and abortion were considered normal and proper.