also i noticed that a lot of stuff on the ftb wiki is outdated. e.g. the tutorial video on the link you posted.
as you can see in the screenshot i submitted, i have it properly set up.
energy, water and resources are supplied and the types are set or bugged to not be set.
if i try to supply water bottles instead of empty ones with fluid water it still just idles.
i also tried replacing the block and test it in singleplayer. first i thought it is maybe a config setting but there are almost no settings for the brewer specifically. it also won't work in singleplayer.