I'd argue though, if you use a single password for everything, its probably more secure to add it here to at least get an indication when it's breached. Your surface in that case is already so large that the difference is negligible compared to the gained warning.
I have to say though, haveibeenpwned is very well regarded in the industry, and is run by a well known security expert. A leak from there would be quite the blow to his reputation.
on the second picture it sits on an extremely oversized plate, and on the first picture someone has gone through the trouble of cutting one of those under cake cardboard thingies to the exact shape of the icing for some reason
oh fuck me