So, I don't know whether my understanding of the english "etc" was
correct, since I believed that it *could* be used too, in reference to
verbs, while here seemingly/apparently it says that it is used after a
string/sequence of nouns.

Yes, you can use etc. with a list of verbs or any other part of speech, provided the entire list is just one type (no mixing of nouns and verbs, for instance).