You know if they had legit evidence that talos is not a god I would hate them less but no it was only cause he was a human and not a high elf.
Of course they know Talos
is a god. Everything they do is based on it. They are trying to undo Talos's divinity, and thus, weakening the material prison they despise.
The Thalmor are not that stupid and Bethesda's employees are not
that horrible writers to base their villains just on "meeeh, Talos is no elf so he can't be a god".
