I think it’s pretty clear he got that information, along with many of his other dark secrets, from the Basalisk.
I see the evidence for that, but I also see Dumbledore implying otherwise in chapter 39:
“Voldemort stole the book from which he gleaned his secret; it was not there when I went to look for it.
I forgot about that part. That makes sense.
Pengvado’s comment means that the plot hole still existed. But the Basalisk is a better fix than Grindelwald.
I think it’s pretty clear he got that information, along with many of his other dark secrets, from the Basalisk.
I see the evidence for that, but I also see Dumbledore implying otherwise in chapter 39:
I forgot about that part. That makes sense.
Pengvado’s comment means that the plot hole still existed. But the Basalisk is a better fix than Grindelwald.