That method of ignorance could ofcourse work but it's more difficult to direct everyone to follow that advice than to control just one person to do as you wish.
Removing his user id won't make a big difference tho, that's just a temporary solution. Now is when this forum should be redone for the real customers only and then lock out all the other trolls.
Hervé: You and the other mods should send a mail to NL asking for full forum access and mod rights so you can sort out issues and other troubles surfacing on here. That would help alot and it would keep the forum cleaner and nicer aswell.