Basically confirms nothing. The F-35 is a strike fighter like the F/A-18. It was never meant to be a light interceptor like the F-16. As the F-16/18 pilot in the article I posted said:
"To me, it sounds like a Hornet fighting a Viper. Of course, a Hornet is not going to do well against an F-16 in a sustained rate fight. Its strength is to get slow and use its angle of attack advantage, much like the F-35 did here. It also bleeds energy rapidly and struggles to get it back once bled down. The fact the heavier, drag-encumbered F-35 had this problem is not surprising to me–despite its monstrous amount of available thrust, and it doesn’t mean much in the grand scheme of things."
Now the Hornet is generally considered to be a very good strike fighter. Perhaps you haven't noticed but the F-16 was designed for a role that is no longer needed, or perhaps was never needed. Ever since the introduction of the F-16A the USAF have tried to turn it into a better strike fighter. Putting more bombs and fuel on it. The F-16i that you guys in Israel are flying is perhaps the best example of this. The F-35 was never intended to be an F-16. It was designed to replace the F-16 as the USAF's strike fighter.