It's my understanding that when a species is banned the vendor has a limited period to sell through (I've seen two years stated before but also recently read that water hyacinth could be sold until August, which would make it only about a year since it was put on the list) although I can't work out if this is vendor, as in lfs, or wholesaler.
The plant above however has been banned for years so shouldn't be available. It could be a case of mistaken identity as there are sp nearly identical and they might have had old labels lying around but I doubt that.