I wouldn't qualify it as a subsidy. It was a credit that you take on your taxes. It's picking nits, sure, but subsidy sounds like the federal govt rolled up a truck full of money at EV car makers' factories.
The Federal government and state governments paying ~$10k to people who buy Teslas is the definition of a subsidy. People wrote $50k checks to Tesla and got $10k from the government for doing so.