He's using a cheat client. If you are on a server like: Hypixel, hive, mineplex etc, then you will most likely be banned permanently or temporary. Sometimes they'll even IP-ban you. If you don't like those risks don't get a client. Though if you want to use a client I suggest Wurst: www.wurstclient.net/download/ If you wanna cheat on something like survival, then I suggest Impact: impactdevelopment.github.io
