As far as I can tell, the article cites two things: $500M tax savings by using an accelerated depreciation schedule (unclear if they saved $500M more by using accelerated vs a regular depreciation schedule, but I assume no) and they claimed $300M in tax credits.
The article doesn't address the other $1.5B, presumably because it's easier to defend. I didn't read through the 10-K to try and figure this out.
I don't really know enough about what an accelerated depreciation schedule implies, but, taken at face value, they'd have to pay more in taxes in a deferred year which doesn't seem like foul play to me. Tax credits seem to make sense for an EV company?
EDIT: I did some learning, woohoo.
Federal corporate tax rate in America is 21%. The $300M in tax credits is post-tax not pre-tax. The $500M is a pre-tax deduction.
$2.3B - $0.5B = $1.8B
$1.8B * 0.21 = $378M
$378M - $300M = $78M
So, I can't really explain why they didn't owe ~$78M in taxes, but I assume rounding and cursory other stuff. The article probably didn't call out other, minor deductions, but it's also fair of them to not have done so. I was wrong when I said, "The article doesn't address the other $1.5B, presumably because it's easier to defend."
I think the real thing here is the weaponization of EV tax credits as some sort of boogeyman. Personally, I'm all for incentivizing EV companies to create in America.