Of course everyone knows that the F-35 can carry external loads. That's why it's an F-35 and not an F-117. It's not "another plus to it's [sic] versatility", it's one of the basic requirements that have cost $50bn to meet.
The question is whether the 22,000 pound load identified by the teenage-video-player name of "beast" mode is realistic, or even attainable.