This doesn't sound right because FDA banned the use of sulfites

In 1986, FDA ruled that sulfites used specifically as preservatives must
be listed on the label, regardless of the amount in the finished
product. Sulfites used in food processing but not serving as
preservatives in the final food must be listed on the label if present
at levels of 10 parts per million or higher. Regulations issued in 1990
extended these required listings to standardized foods.

Also in 1986, FDA banned the use of sulfites on fruits and vegetables
intended to be eaten raw, such as in salad bars and grocery store
produce sections. Grocers and restaurateurs were using them to maintain
the color and crispness of fresh produce.