The n is not sounded on the audio. Pronunciation did nkt accept my audio without the "n" sound. With the "n" spoken in "uamini" it accepted it. Again, the same problem in French. Great Duo program but 0 reliable audio.
The n is not unspoken, its just very soft. When you speak italian some letters might not be pronounced because if you are fluent you tend to go a little fast not spell them perfectly. But i swear to you that i have never prnounced uomini without an n on purpose
If you add a subject (but remove the pronoun) you may be able to find out what the pronoun is in translation, for example: "Sono uomini." Since "uomini" is plural for "uomo" (man) you can tell it's in the third-person plural form ("We are men" would be "Noi siamo uomini").
"Uomini" isn't the subject, but rather the predicate of the above-mentioned sentence. Linguistically, "Io" (first person, singular) and "loro" (third person, plural) should not share the same form of the verb "to be" "sono."
"Loro sono gli uomini" would mean "they are the men." Here, "uomini" is the predicate of the sentence (the sentence only indicates that they are men), following the copula "sono," so the article is optional, depending on whether or not the specification is intended.