Journalists and people always tend to over-exaggerate numbers without really considering what they mean. The 17,200 figure itself is meaningless without an accompanying number describing the actual amounts of NF3 gas being generated. Percent increase of NF3 by itself is also meaningless. And even if you know the actual amounts of NF3 gas, the article states "Solar panels aren’t the only source of NF3, which is also used to produce semiconductors and LCD flat screens" so you need to know the amount of NF3 gas being generated from the creation of solar panels alone.
Furthermore, as the NF3 gas is only generated in the creation process, over time the production of solar panels might stop increasing after we have enough.
Aside from that it's very debatable what the 17,200 figure itself means. It is only explained partially in the linked paper within the linked article. And probably if you know how it's derived it will not have a very confident scientific basis or meaning behind it. Many people and some experts debate whether global warming exists or is accurately modeled at all, and rightfully so.
Finally, even if the NF3 production of solar panels is somewhat of a problem, this is unrelated to the fact that they produce energy via alternative methods, conserving our limited fossil fuel sources, etc. So LEED will probably always embrace it. From what I recall in practice LEED is mostly concerned with whether or not our buildings waste electricity. So to be LEED certified our buildings have to not be overly brightly lit, and it helps to have mechanisms that turn off lights automatically (though this may be annoying to the inhabitants) or generate their own electricity, etc.