JenK, that blog has a list of a lot of organizations attempting to remedy the alleged problem which is all well and good. However I see not a word there about why the outdoors isn't a safe and equitable place for all; the descriptions seem to assume a problem without providing evidence.
And by the way, I'd suggest you also include Big City Mountaineers, a group that takes inner city youth backpacking etc. I've volunteered with them and they do great work (sadly not last summer with COVID though). Some of the kids they take into the backcountry have never seen stars.