I'm not sure I understand how the wiring harness shortage is specific to ICE vehicles. EVs require harnesses also; in fact, many (most?) of us are currently awaiting a replacement of the rear harness under recall.

 

If I read the article correctly, their point was hand-made harnesses in ICE vehicles vs. digitally-made harnesses in newer vehicles that are predominantly EVs. And you're right…then there's that pesky rear harness issue about which I'm hearing crickets from Tesla.