They're not talking about Discord and their employees having your IP, they're talking about teamspeak server admins being able to see it and using it for nefarious means. On Discord, just because someone joins a server you created doesn't mean you get their IP. With teamspeak being decentralized, your IP is sent to admins which are much closer and interested in the same topics you are, so if you make them mad, they have the ability to retaliate by performing a DDOS or geolocating you to expose your location. With Discord, there's trust that Discord isn't going to suddenly make your IP address public for some reason - even if you make an employee mad, them accessing your IP just to leak it would be jeopardizing their cushy VC-backed job all just to 'expose' someone on the internet.