Apparently, SpaceX has used Tesla engineers in the past, to help them evaluate/integrate Tesla parts into SpaceX designs. If Tesla is okay with doing consulting for one of Musk's other businesses, why not another?
Legally, Musk has to pay Tesla for this, and someone very senior at Tesla (the board or the senior executive team) has to approve – without Musk being in the room. But, why wouldn't they say "yes"?
So I don't think this story is fundamentally implausible. (As I pointed out in a comment on another post, the "code review" was probably actually an "architecture review", but it is easy for non-technical people to elide the difference.)
Legally, Musk has to pay Tesla for this, and someone very senior at Tesla (the board or the senior executive team) has to approve – without Musk being in the room. But, why wouldn't they say "yes"?
So I don't think this story is fundamentally implausible. (As I pointed out in a comment on another post, the "code review" was probably actually an "architecture review", but it is easy for non-technical people to elide the difference.)