You obviously haven't been trading long if you haven't seen what I'm talking about at least a few times by now. 1. It's a common scare tactic, that once hit they leave. Sometimes its 10,000 sometimes its tons but in this case based off experience I doubt its anything. He will either move once hit or stay you can't say because he's sitting there he is diluting. THAT IS A FALSE STATEMENT PERIOD. He has to get hit with over what he is showing multiple times to indicate dilution. He hasn't been hit at all yet so that answers the question.
Just so you know I have also worked alongside people/traders who MPID codes have actually registered as VNDM. We all register different ones via L2 when we trade. I have actually seen several times normal traders MPID's register as VNDM. Fun little fact.