It says Galaxy Note 8 so they are basically saying it's good to go. Some chargers are just going to run hot. That's why the Samsung's latest (the one I got with my 8 during pre-order promo) has fan built in to cool.
You're phone will ultimately not be destroyed by it as your phone will probably have some safety mechanisms built in. But more heat will behave the battery a little faster. I'd go with the Samsung version as it has the built in fan.