Also... a real suspicious thing is....
Just the claim they determined masses is really odd, The observatories cant tell how far away this merger is, maybe just a general direction.
Gravitational waves, like light waves, should be 'redshifted'... mass determination would be calculated from the periodicity of the orbits, but that period will also be redshifted... the observed period would be a functon of the mass of the objects plus the redshift. Without knowing the distance you shouldn't be able to estimate the mass...