"at sea" is reasonable and attention grabbing, "in the sea" is just click-bait junk.

For some reason the headline got me thinking that they were throwing cars into the sea.

Not really... Oil is "parked at sea" right now and you see the effect. Too much supply is too much. I live in a medium sized city and parking garages are full of rental cars as they have no where to put them. All of our dealers have lots full to the brim. Sales fell off a cliff.

When the overhead shot of the cars was loading, the initial blurring made it look like they were lined up in 20' of water.

well that and it certainly is not just SUVs but that does make for a more click bait title.

It would be interesting to see how many products are affected that sit on container ships. I have not seen any slowness in delivery of mailed items, specifically ebay auctions that were shipped from China

Yeah, slightly click-baity