If I remember correctly, they are asking for a certain average number of words daily. If you were offered the nonexclusive contract then you can keep publishing on other sites.
I accepted my contract but after I sent that PDF form along with accompanying attachments, my submission was rejected a couple of days later. I didn't know why since no one tells me why. That robotic messenger assistant thingy is no help at all. So I tried again and after that second try was denied as well, I gave up.
Maybe you will have a better experience. Wait for a response for at least a week, maybe they are a little busy, then after, decide for yourself