As you say, this particular email says nothing except that he "met" Joe Biden, which could be as little as getting the opportunity to shake his hand. Probably more important would be to verify the May 12, 2014 email with the subject "urgent issue", which requests "advice on how you could use your influence". That would at least verify that "influence" was considered on of the key things of value that Hunter Biden was providing.
As you say, this particular email says nothing except that he "met" Joe Biden, which could be as little as getting the opportunity to shake his hand. Probably more important would be to verify the May 12, 2014 email with the subject "urgent issue", which requests "advice on how you could use your influence". That would at least verify that "influence" was considered on of the key things of value that Hunter Biden was providing.