That's correct. Something about the measles organism in the vaccine, then remaining in the child's gut, continues to disable the production of a normal amino acid that (I think) prevents the body from absorbing and/or being affected by heavy metals in the body. When the gut is biopsied the measles virus or its residual can be detected; that's how the connection was made.
It is odd, indeed, that kids are not allowed to play with elemental mercury, which is relatively inert, but are injected with mercury compounds, which are much more dangerous. It's a strange, irrational PC world.....