But that’s not a blood libel. Like, literally not a blood libel.
Substitute the Jewish father in that story with any other stripe of pagan, heretic, apostate, or schismatic, and the thrust would still be the same: the miraculous intervention by Mary to save a non-Christian child from death.
That’s a fair assessment. But it is easy to see why Y might be seen as Jew-hating; he’s just not very judicious.