2010? Seriously that is what the article says.... Do you know it is 2016...
He released through 2016 today.
He might have made public a copy of that.
But an extension tells you nothing.
You give a number for your income and the tax you owe and attach a check for that amount.
No details.
Before the time runs out on the extension, you do the full report and pay any difference.
Filing the extension keeps you from being delinquent.
As I used a CPA, I do not remember all of the details even though the nature of my business caused me to file a dozen or so over the years. But that is the basics.
If my memory is correct, you don't even need to sign the extension as your CPA can sign it for you.
So if it is correct that Cruz got an extension and showed that, he has done nothing.