Could it possibly be that some Progressive senior executives have Teslas?
I do not know, but I do know personal vehicle ownership within auto insurers underwriting/marketing/claims executives does influence underwriting practices.
The new Progressive CEO is Tricia Griffith who has led the company to expand the customer relationships across multiple lines. Part of that appears to be a decided effort to use upscale auto policies to help cross sell into lucrative home and other covers in upscale dwellings. There is evidence that the strategy has been succeeding, and that is why Ms. Griffith was made CEO in mid-2016. realistically the increased efforts to cross-sell upscale customers are likely to be the biggest pro-Tesla influences, such as they may be.
Tesla interests among executives can only help if they exist.
it would be very interesting to know about Tesla ownership among insurance executives anyway.