I think the parent commenter was agreeing with you. The English idiom "could do with" (which I think is somewhat uncommon in California, where I live) means something like "could benefit from", "still needs", or "would like". It suggests that someone doesn't yet have the thing that they "could do with", but that it would be good if they did, at least from the speaker's perspective.

https://en.wiktionary.org/wiki/could_do_with