Many people are considering growing some veggies at home, to help stretch out reserves. Many scam artists try to sell fictional products to take advantage even in normal times.

The amazing striped bell peppers depicted here are propagated by tissue culture, not seeds.

For some further details about that bell pepper. http://the-biologist-is-in.blogspot.com/2017/02/biology-of-enjoya-pepper.html

That particular vendor may just be misinformed. Their online presence doesn't really read as a complete scammer, just someone trying to make some sales. I did let them know the seeds they saved from the grocer produce won't grow into new striped peppers.