It's a preservative still used in vaccines. Even the CDC site lists what vaxes it's used in. The amount has been decreased, yes, but it's still there.
I think this is a great study. As for the monkeys being removed from their mothers...well, while not great I don't see how else to do a study to get information. Nothing will ever be "perfect" and "acceptable" to all people. Do I feel bad for the monkeys? Sure. But I feel more relief that someone, somewhere is doing something to show the naysayers that there is an issue.
Jenn