Not at all. These con artists can be convincing, but they are not legit. Constitutional arguments against the tax laws are routinely dismissed by courts, and their proponents are fined or jailed. More sophisticated scams involve multiple family trusts, limited partnerships, and credit cards issued by offshore banks. While these schemes can confuse and slow down the IRS, they are bogus, period.
For secrets, tips and insider information on how to deal with the IRS, read Stand Up to the IRS, by Frederick Daily (Nolo).