That isn’t proof, of course. That shows one station. And if you read Tesla’s statement,
Tesla Model 3: Elon Musk shares images of the production line, they don’t explicitly deny the statement that there was at least one hand built welding station in September. As I wrote, and Tesla itself acknowledges in their statement, their production lines evolve over time and initially include many hand built steps that eventually turn into automated steps. The WSJ is sticking to its story that as of September there were manual welding stations for Model 3. Tesla’s statement wasn’t Elon’s usual specific rebuttle, it was instead a vague corporate non-denial denial.