It's useless to try to judge that pace. It depends on the terrain, which is hard to get a feel for from afar. We can assume there's elevation and uneven terrain, but to what extent?

But first out of 500 ultra-marathoners from 12 countries means it's probably a very good pace.

That's what it says, and No, 7 hours for that distance is not particularly fast. Of course it doesn't say what the terrain is like.

That averages to 4.4 miles per hour or 13.62 minutes per mile.