They could just as easily say, "Data reviewed did not demonstrate convincing evidence of safety from doses of thimerosal used in vaccines."
Placebo-controlled, double-blind clinical trials have never been completed to evaluate the safety of thimerosal. Partly because it would be unethical to inject a known toxin into people to determine it's safety.
If these trials had been done, and health authorities were convinced it was safe, they would allow thimerosal in vaccines because it is a huge cost saver. But instead, through the actions they took, they made it clear it is not worth the risk.
As an environmental engineer I've witnessed this tactic over and over. Authorities claim there is no evidence of danger, but remove the toxin anyways, because they know it's danger is plausible, and the funding and time isn't there to prove it one way or the other. Absence of evidence is not evidence of absence.
It's not like they are going to say, "we think we may have poisoned people, so we're removing this toxin." That's a great way to destroy your livelihood, reputation, and invite prosecution.