Translation:They are already full.
Yes, but I think he means that 很 is often used in a sentence even though the speaker isn't emphasizing "very". Looking at the "hover over hint" shows 很 can also = is or be used to connect adjectives. From many conversations with native speakers from both Taiwan and the mainland I can confirm that 很 does not always mean "very". That said, translations of this sentence either with or without "very" are both "correct" and currently accepted.