Unlikely, as they would have simply removed/blocked access to the "Dev" part for everybody until they fixed the issue. They would do this as it would only **** of the Devs, would result in no media spotlight, no news and no consumers would probably not even be aware of it.
Instead they have had to take down the whole network, suffer horrible PR and **** off a lot of gamers, most likely for a very good reason.
We dont know how the PSN is structured, a dev could just be a normal user with extra priviliges and now they could be seperating the two data types. If there was a simple way to just block Devs then the people at Sony would have done it.