These are only symbols used to transmit feelings and emotions. They learn the whole language, pronunciation, vocabulary, concepts, style and all, but Chomsky's work pertains specifically to grammar, and indeed only the universal part of grammar. Instead he points out the time factors involved. For some, an evolutionary story makes more sense than for others. There are problems with an adaptive story for UG, but much fewer problems for an adaptive story of the advantages of being able to exchange symbolic propositions as we are now.
Trouble is, that's too general, and is probably based on a bundle of capacities.
And in this respect, Chomsky seems to be describing the facts more explicitly than Pinker and Bloom.