I understand that and I think Trump meant raising taxes on hedge funds - he didn’t clarify, but he has always said that. In other words - alternative incomes.
The hedge fund tax has to do with taxes on gains instead of earned income.
Trump makes a good point here, this is an unfair differential in sources of income.
Of course a tax on revenue or sales is fairest, because it make the illegals in the underground economy ( ~10% of GDP ) participate.