Actually, 18 is when it’s made (compiled). Week 18 is/was last week. We get week x the next week.Knowing the “week 18” update would be coming out in week 18 of the calendar year probably shouldn’t be heralded as a great insight into the inner workings of Tesla.
But your point is still well taken. Saying that 2018.18 is coming out the week of May 7 isn’t earthshaking! .