Olives have to be cured in e.g. lye to become edible. Wouldn’t that kill off pathogens?

If this were a real concern as you're hypothesizing, then we'd already have the data of olive oil making tons of people sick. Even relatively tiny outbreaks of food borne illness from spinach make the news, so where are all the people getting salmonella from olive oil? When the observed data doesn't fit your theory, then you need to reevaluate your theory no matter how much common sense it seems to make.

If the figures of the article are accurate, there is something in the neighborhood of one dead bird per ton of olive oil from Portugal. That's enough that if it were poisoning the oil, people would be dropping dead in droves. Consuming olive oil would be like playing Russian roulette.. but it's not.

Fruits and vegetables grow out in the open. A significant portion of the produce people consume is statistically guaranteed to have been anointed (so to speak) by passing birds and other wildlife already.

I guess plenty of bird poo is already with the harvest. If birds sit on trees, a lot of poo is bound to get stuck on branches

Birds shit on the olives when they're still alive too. Olives grow outside. Outside is not a sterile environment.

When I was working at a green bean processing plant years ago, my first job was picking non-bean objects out by hand. Usually the non-bean objects were sticks, but many times a day it was a dead snake or frog. That's just the nature of those harvesters. The beans get rinsed and nobody worries about it.