Is Alexander supposed to be strong or not?

[Hunter of Shadows]

When Daniel writes that Alexander is "old and weak", he's clearly lying - had he written that Alexander was otherwordly strong, then Daniel probably wouldn't have had the courage to get revenge...

That or he actually believes that Alexander is old and weak?

Daniel might not have understood that Alexander isn't human then, or even until near the end as it only hints at the fact throughout the game