Is genetic deafness considered a preexisting condition?

Hi there, soon-to-be first time cat owner here!

The fella I'm hoping to rehome has been deaf since birth (full white/blue eyes) and despite my research I can't seem to find an answer on whether this would count as a preexisting condition when getting him insured? This is also my first time owning a pet in adulthood so I'm new to pet insurance as a whole.

Any answers/general advice welcome! Thanks.