That and the fact that it's explicitly called out in the 1790 law.
Too bad they overrode it with the 1795 law.
And it is also a fact that Blackstone was the most relevant piece of legal doctrine in the early republic particularly as for as legal theory goes.
The Founding Fathers were creating a "Novus Ordo Seclorum", just like it say on every dollar bill in your wallet. Blackstone was a reference, not a straightjacket.
The Founders were attempting to attain the “rights of Englishmen” and their legal code was based upon the laws of England which defined those rights. There was no massive overturning of traditional legal codes as with the French or Russian Revolutions.
They were defending rights being taken away in their view.