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Car dealers say they can’t sell EVs, tell Biden to slow their rollout
(arstechnica.com)
This is a most excellent place for technology news and articles.
As I understand it, the $7.5k isn't any EV, but EVs that were assembled/built primarily in the US. Many weren't compliant with that legislation. Not out of spite or anything, but because manufacturing wasn't quite ready to comply. That led to a number of vehicles sitting ineligible for the 7.5k break. As well as consumer confusion over which ones could be discounted. Overall, a transitional growing pain for a crappy industry that relies on monthly sales.
You are correct, and the exact definition/requirement has changed a few times. But many (most?) EVs for sale in the US are eligible. The vehicles themselves are assembled in the US, the big sticking point was the battery. It's something that gets buried in the details rather than advertised at the top. I can confirm the Chevy Bolt is advertised at ~$35k, but in the details you can see that it's eligible for the rebate, effectively bringing it down to ~$27.5k.
A detail to confirm when shopping, but one that is common.