No, it wasn't. At first it was only enabled on enwiki. On commons was activated on Brianna's request.

"Essjay" wrote:

Tim 'avatar' Bartel wrote:
Hi Wikipedians,

Brianna Laugher wrote on 07/18/2006 05:04 PM:
  
While they're blocked they can still edit their talk page.
    
Do they? I haven't tested it at the Commons, but in DE.
A blocked user (in DE) is not able to edit his talk page.
It's blocked like every other page.

Bye, Tim.

    
That should be reported to wikitech-l; as far as I know, the "blocked users can edit their own talk pages" fix was enabled everywhere around this time last year.

Essjay