"A Tesla spokesman declined to provide MarketWatch with a copy of the memo reportedly sent to some vendors that was referenced in the report."
Why?
Business confidential.
Not good supplier relations to air the dirty laundry.
Dear Supplier Z,
You were contracted on or about 2016 to perform the task of ___. You have fail miserably. Please refund the amount of ___.
Yours truly, POed customer.
Otherwise known as nunya.