You can't just throw revenue in the denominator, though. Business tax is assessed on income. If you're going to make a claim about tax rate using an unconventional metric, you need to be explicit about what you've done; Reich isn't.
Can’t say I agree, though. I don’t recall ever having seen one of his posts on HN, and a cursory search suggests they’re not even upvoted that much. Highest I found was under 30 points. But my methodology is flawed, as I basically searched for the name.
How is spreading misinformation looking out for the workers?
Income (in a business) is another word for revenue. I think you meant: business tax is assessed on profit.
It does say that unqualified "income" means the net version but it's a push to say that makes it unambiguous. (And, at I said on a sibling comment, this seems to be a US convention.)
https://en.wikipedia.org/wiki/Income_(United_States_legal_de...
The one exception is HMRC (UK equivalent of IRS) which, for the purposes of corporation tax only, defines income like profit [2] (with some technical differences, but the same spirit). But for other purposes (e.g. personal income tax) even they use it to just literally mean cash received without subtracting off outgoings.
Using it in this net sense seems very odd to me, but maybe that's because I'm British. "Income" and "outgoings" look to me like symmetrical terms, and no one would consider outgoings to be after subtracting off money coming in (would they?!)
[1] https://www.cheapaccounting.co.uk/blog/index.php/income-prof...
[2] https://www.gov.uk/hmrc-internal-manuals/company-taxation-ma...