Many humans are severely allergic to peanuts, but nobody would expect peanuts to be labeled "toxic" for that reason.

(That also doesn't explain "bottled water" being listed as toxic. There's something very wrong with this data.)

It's toxic to them like alcohol is technically toxic to humans. Kidneys and liver filter out what they can enough to survive casual consumption. Some people can drink an entire bottle of vodka; most people shouldn't.