Sort of. Beer is usually treated as a substance, i.e. an uncountable noun, like milk, rice, and even cheese, bread, etc. Some of these kinds of nouns are also occasionally treated as countable, so you might sometimes see "different kinds of bread and cheese" or "different breads and cheeses" when talking about variety. Friends might also "go out for a few beers". However, "the beers are delicious" does not sound right to my American ear. I would say "the beer is delicious", because it's not the individual bottles of beer that are delicious, it's "beer" in the abstract, i.e. the uncountable substance, that we are referring to. Strangely, duolingo doesn't accept this answer (I've reported it).
It sounds fine to my American ear, if (and only if) it is referring to different varieties — e.g. “When we visited the brewery, I sampled a lager, a stout, and an IPA. All three beers were delicious.”
Beer can be used as singular or plural in English. "The beers are delicious" would only be a correct sentence in certain circumstances, for example, when talking about different varieties of beer.
As a native speaker of American English, I think it sounds fine. I would assume it is talking about different varieties or different glasses full of beer.