Wikipedia rabbit holes? Never heard of them, why?

This tree looks to increase the toxicity of its leaves to deter giraffe.

They can send a chemical that will make their leaves taste bad.

The secret glue that holds all life together

Makes sense. If animals are about to start eating, they'll want the fruit to be ready. Obviously the seeds need to be ready, but also the flavour of the fruits themselves so animals don't ignore them and they all end up rotting directly below their parent.

Or, from another angle, one tree that doesn't want animals eating it emits chemical that causes fruit of other trees to be more attractive so animals are less likely to waste time eating the comparatively less nutritious leaves or bark.

And adding a layer to that, even if the animals that like to eat its bark/leaves aren't interested in the fruit, if other animals are attracted to the fruit, it can attract more predators that might be happy to eat animals looking for bark/leaves as well as those looking for fruit. And both predators and prey might also be directly attracted to the original chemical the tree released.

Or it might just be a coincidence. Actually, even if it is functional in those ways or others, it's still a coincidence because that's how evolution works, it just stuck around either because it works or because it's tied to some other trait that does with and doesn't cost enough to be a net negative.

Note: this is all speculation, not based on any specific knowledge about this tree or ecosystem.