By itself this is a ridiculous statement - as you yourself hopefully realize? After all, this would DE CLARE all people without any mercury issues as "heavily burdened by mercury". It's like declaring everyone insane who acts sane, because only insane people try to hide that they are insane by acting sane.
This is a 30 time DMPS and 100+ time DMSA user speaking, so I can hardly be accused of being a "mercury sceptic". But I HATE bad logic. If you have to resort to "word-violence" (as in violence ON words not human-to-human violence expressed in words) to make a point, remaining silent is better.