It does in principle state that even when there is one witness, a man can be put to death.
The text never suggests that. Rather, your presuming that in order to force a bifurcation. This is the making of a false dilemma.
The basis for putting the man to death is not mentioned.
Then it is false to say "in principle even when there is one witness, a man can be put to death".
This is what Mr. Angus wanted Mr. Jackson to explore as it seems to deviate from the position that an allegation can only be acted upon when there are two witnesses. In that situation, the man can confess. Then there would be the two witnesses required for executing him. Mr. Jackson would have said that to get out of the noose.
I'm sure Stewart wanted Jackson to explore alternate means of achieving justice for a victim. That's fine. My point is that using the text of Deuteronomy 22 was a gamble because that text does not suggest any person would be punished based solely on an allegation made by one person. It's just not in the text. You have to read that into the text to put it there.
A secondary point, but revealing nevertheless, is that His Highness, Mr. Guardian-of-Doctrine Jackson failed to see the blatant false dilemma when it was presented to him supposedly with scriptural merit. How can anyone be some kind of Guardian-of-Doctrine when they don't immediately see a false dilemma presented on the very turf which they are supposedly a guardian of?