In reply to UKC News:
First of all, this accomplishment appears to be overshadowed by unfortunate and unrelated death of experienced Spanish climber Sergi Mingote as he descended on K2.
Apart from that, we'll have to wait for details on exactly how this climb was conducted.
My understanding, from Alan Arnette's blog, is that they had at least some members working hard with oxygen, and perhaps others without oxygen...but none of that is confirmed.
Many other "firsts" still await...the first without oxygen (if oxygen was used on this ascent), the first solo...and so on. These are meaningful distinctions, for people who operate in this world.
But that does note take away from the amazing accomplishment and spirit of this combined team.
To me, it truly seems like a first, with both mountaineering, cultural, and historical significance.