houseplants

I have read here on these forums and a couple of other places that pothos is toxic for birds. Then I ran across this website listing pothos as safe for birds, List of Safe Plants for Your Bird. . Why would they say it is safe?

My friend's Green Cheek Conure chewed on a house plant- I think it is a succulent about three hours ago and now won't eat his favorite food. He seems ok except for low energy. Can conures get an "upset stomach" from chewing on plants like that? Is there anything to do to help him? thanks!