Midway through the article it finally mentions that this was with the "radar invisibility cloak" turned off by installing Luneburg lenses to make it radar visib

Midway through the article it finally mentions that this was with the "radar invisibility cloak" turned off by installing Luneburg lenses to make it radar visible. I don't doubt that there are current advances in radar technology that weaken the stealth claims of the F-35, but I don't think that this specific case demonstrates this.