Along with many other accounts, it's locked due to being affected by the 2015 data breach and then sitting inactive for a long time
There are three times forum was hacked and data breaches.
Thank you for clarifying the DPR account case, but for anyone who want to know more about forum data breaches in 2011, 2013, and 2015, there we go.
Bitcointalk history of hacks and vandalism.