We call it ‘the great flood’
The critique in this thread is interesting, and expected. I agree with your comment, however.
I've been following genomics for a number of years and the science behind these studies appears sound, entirely dependent upon the power of the processors performing the number crunching. However, as with all aspects of such simulations, GIGO applies, and I cannot deny a GIGO aspect to this study. As well, there are glaring gaps in data which may never be filled.
The 'great flood' was extinction #2, IMHO.
We are now at the precipice of #3. The part of my comment that I chose not to assign to the OP was speculation about how our era might be viewed by those 900k in the future.
Architects of our own demise.