What you read is correct.

While it is possible to cross pollinate beans to make hybrid seed, the process is difficult and making hybrid seed on a large scale is impractical. Therefore, all commercially produced bean seed is open pollinated.

This is different from tomatoes or corn, where the methods for controlled cross pollination make it easy to produce F1 hybrid seed in large quantities. This is why you will see many F1 hybrid corn and tomato varieties, but no beans.

Jim