Pirelli have been making high deg tyres for years. This issue is entirely separate from the high deg request by the FIA.
It's a recent alteration to their manufacturing process that's gone wrong, which isn't anything to do with the FIA. It was the start of this season that Pirelli implemented some changes to the tyre structure (as opposed to the compound, which also changed). This change led to the delaminating problem and it would appear that in their attempts to fix this, they've made it even worse with fully exploding tyres.
Absolutely none of this is related to the FIA requesting high wear tyres several years ago. The regulations and requests didn't change for 2013, Pirelli just made alterations off their own back.
I don't know why people are getting so mixed up between 'FIA ask for high deg tyres, Pirelli supply them, no one likes them' and 'Pirelli try a new structure, tyres explode', they are very clearly distinct issues.