It just got to the front page of HN, which includes a large percentage of users who buy and use WD-40 [1]. That alone might be worth the price of admission. You could also think about this as a collab between WD-40 and Javascript, which is pretty funny.

The author is presumably posting this video and blog everywhere, which only further amplifies WD-40's outreach. And they themselves now have a positive brand association with WD-40.

[1] I just used WD-40 last night. I'm actually shocked the author had to go and buy a can of it.