I love how they say Jesus is not the mediator of the "Great Crowd" but don't actually use those terms. Now that I'm awake and thinking again, I can see their innuendos that I missed just a few months ago.
The same article that pixel quoted above states the following about those that are not part of the 144,000:
14. Why should all Christians, whatever their hope, truly appreciate Jesus’ role as Mediator?
14 What about those who are not in the new covenant, those who hope to live forever on earth, not in heaven? While not participants in the new covenant, these are beneficiaries of it. They receive forgiveness of their sins and are declared righteous as God’s friends. (Jas. 2:23; 1 John 2:1, 2) Whether we have a heavenly hope or an earthly hope, each one of us has good reason to appreciate Jesus’ role as the Mediator of the new covenant.
So they don't directly state that Jesus is not the mediator for the "Great Crowd", but state that they do not participate in the covenant that Jesus is mediating. It's easy for someone who is not reasoning or just looking for an answer in the paragraph to miss the connection.