2011 taxes were due in April, but so long as all the money is in (possibly in estimated tax payments with an extension form), most people and organizations don't need to submit the full paperwork until six months later. Rather famously right now, Mitt Romney hasn't. (He's promised to make this year's and last year's returns public, but this year's isn't done yet.) So, it's quite possible that a bare-bones charity is also taking advantage of the extension.
(You won't get any refund until you file the full return, you'll get hit with penalties if your estimated payments undershot the actual tax due by very much, and shorter deadlines may apply in particular cases, like people filing from overseas. But most folks can get the full six months.)
Political commentary aside, his comment is accurate and should not be downvoted.
Taxes are due in April, usually on the 15th. Income returns and information returns are nominally due in April but the filing deadline can be extended to September. Extending the filing deadline does not extend the deadline for payment, so taxpayers seeking extensions should pay their estimated taxes by April and will receive a refund if they later discover that they overpaid.
(You won't get any refund until you file the full return, you'll get hit with penalties if your estimated payments undershot the actual tax due by very much, and shorter deadlines may apply in particular cases, like people filing from overseas. But most folks can get the full six months.)