His comment is correct, that in the end you can only get credit vs your tax liability.
See this post and related video, explaining how they will recapture if you were paid excess credit.
You really think that backlog is going to hold up? I suspect at least 50% if not more of those orders will disappear between now and January. There is NO reason to take a delivery now if you can get $7,500 come January. I think we're already seeing it with the Performance. I had to wait 18 days...
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