I'm sure other tank classes can tank him fine with enough healing but DK's definitely have an advantage on Plasma Blast.
We can use ice blood fortitude on the first blast (50% damage taken) which has a 1 minute CD and then burn other CD's (anti-magic shell, bone armour) on the next. IBF should be up for the third and army of dead can be used on the fourth followed by another IBF.
He should be dead by then.