Yes,but that still doesn't change the fact that as of now there is no "credible challenge" to LIGO findings.From the same article link you posted:
What it means is that unless one is qualified enough to challenge LIGO findings,all others(aka people like you & me) should assume LIGO findings to be correct until proven otherwise credibly(aka via a research paper in reputed scientific journals & some reputed mainstream print media).Until this finishes playing out, we won't know, but this is what scientific progress unfolding looks like!