They were asking for privacy so their username was hidden from user lists. This is the only modification that was made for them.
Why is the 20GH/s whale the only one who is able to mine during this ddos attack?
Everyone else's hashrate reports 0, but his hashrate is seemingly unaffected:
http://www.clevermining.com/users/1BT9cPLGRep7nXnvo9JoXn6H7sSd5Em2WEThe pool's current hashrate matches his hashrate exactly. You previously said that the only modification made for him was removing his username from the user lists. Does he also have access to his own clevermining server? Does he pay a lower fee than all of us too? Are the rest of the miners here subsidizing him in any way?

Sorry, Terk, but I smell something fishy.
On that guy's last 10 minute stats, the reject rate is compared to a server named "Private B".
He definitely has a private clevermining server.