You're quoting replies to two different posters. Context is important. In the first case the OP/105 set was recommended for a heavy rider. In the second, the OP/Ultegra was suggested for a rider whose weight was not given. Furthermore, there's a significant difference in parts other than the hubs. See if you can find it.

Whether or not a wheel will be appropriate for any particular rider depends upon the size of the rider, the rider's goals, the terrain and the rider's wallet. So, to belabor the point, Open Pro rims on Shimano hubs with quality spokes can be built in to decent wheels. Whether they are appropriate for any particular rider depends upon many factors. So I stand by both posts.