Oh sure, of course.
Just like seeing a rail-thin model doing a line of coke is obviously a great example for children.
How are plus-size models bad examples? What, you think that a woman who is a size 12+ who is HEALTHY is setting a bad example? Well damn, looks like the average woman is now setting a bad example. Plus-sized models are almost never overweight. For the most part, they are just "chubby".
If you are 5'1 and a size 12, no, you might not be healthy. But if you are 5'7 and a size 12, then how is that bad? Just because a woman is a larger size, doesn't mean she's unhealthy. Many women who are rail-thin have as many, if not more, health issues than women who are overweight. And just because someone is a larger size, doesn't mean they are overweight.