According to TDA rules, it is an undercall. If he undercalled the opening bet of a round, he would be required to call the full bet. In the TDA rules,the blinds count as the opening bet preflop. Since it appears in the OP that this is preflop and someone else already raised the opening bet, TDA rules leaves it up to the tounament directors discretion whether to make the player call the full amount or forfiet the 11k. As a note, TDA rules dont allow for gross misunderstanding per se.
I would have posted the rule but for some reason my ipad isnt copying today.