This is from my son, the CPA.
"No. That's not right. There were no changes to the home office deduction or auto expenses for a self employed business owner.
Perhaps he's talking about the itemized deduction rules? Those were changed, and those deductions were eliminated if you were an employee getting a W-2 from someone and trying to claim home office or auto deductions.
But, a self-employed guy shouldn't be deducting their home office and auto expenses as Itemized deductions. They should be business deductions - which are still allowed as always.
Either this guy is an employee getting a W-2, or he's doing his taxes wrong in the first place".