It all depends how busy he is and it has occurred that he's not to keen on talking to much to foreign beer tourist and ends up chatting with me (local) but just keep in mind thats its pretty much a one man show and no matter how much you love beer and everything related I can imagine sometimes your just a little tired of it. And some visitors to tend to stick around for a very long time, remember there are no chairs or anything, you pretty much stand around and watch him work.
When would you be visiting De Cam? You can skip the cafe next door, not worth the visit anymore. Try this place instead, one of my local bars and wonderful on a sunny day with great outside seating and its been there for decades.
https://www.ratebeer.com/p/in-den-haas-gooik/32700/
Save yourself the hassle and rent a car in Brussels, public transport is a nightmare especially on a sunday.