Haven’t followed his reporting but apparently it’s been overtly critical of the F-35. [add standard rants and speculations of industry journalism and corruption and ad revenue etc] He has written a book on the subject before so I’d gather he has investigated it quite a lot. Maybe he still got speculative and overextended. I don’t really know as I don’t have enough expertise to judge. He’s a good writer nevertheless.
EDIT: I misread the reporting, he’s still on the payroll but just not reporting on the F-35 anymore.