That's not true. The OE 22s have a load index of 115. And, as stated in the original post, these are all the tires that Discount Tire's own website shows as compatible.
See known issues at the bottom of the original post.
I've created a list of every compatible tire from Tire Rack (i.e. passenger tires with a minimum load index of 116, or light truck tires with a minimum load index of 113).
It's split into three sheets—one for each wheel diameter. There are some filter views (Data > Filter views) to filter by...