I think it’s pretty clear that Harry doesn’t have a good model of Dumbledore’s beliefs at this point. Later on he figures out that:
Dumbledore really wasn’t afraid of death. Dumbledore honestly, truly believed that death was the next great adventure. Believed it in his core, not just as convenient words used to suppress cognitive dissonance, not just pretending to be wise.
I think it’s pretty clear that Harry doesn’t have a good model of Dumbledore’s beliefs at this point. Later on he figures out that:
Good point! I missed that one.
When does he say this?
Chapter 56