Yeah, the IRS document I linked is incorrect. O.K.
Typical ET. Everyone is always wrong, unless I think otherwise.
If you actually trade (with or without TTS), I wish you well.
I did read your link.
However, it does not apply to trading:
https://www.irs.gov/taxtopics/tc429.html
Gains and losses from selling securities from being a trader aren't subject to self-employment tax.
If the income is not subject to self-employment tax, then it is unearned income.