As explained on the first page of the 2010 IRS Publication 501 Exemptions, Standard Deduction, and Filing Information, the limits on personal exemptions and overall itemized deductions were not applicable to 2010 (nor 2011 and 2012) returns:

Limits on personal exemptions and overall itemized deductions ended. For 2010, you will no longer lose part of your deduction for personal exemptions and itemized deductions, regardless of the amount of your adjusted gross income.

The change for 2010 returns was due to the Tax Relief, Unemployment Insurance Reauthorization and Job Creation Act of 2010 signed into law on December 17, 2010 by President Obama. This expired at the end of 2012. Tax years 2013 - 2017 again included exemption phaseouts as in prior years.

Due to tax reform, personal exemptions have been suspended for tax years 2018-2025.