If you actually would read the discourse more than a google search it was that:

Cosmic ray black holes are likely to have a momentum and would probably fly out to outer space. While LHC micro black holes would stay on Earth and the potential LHC black hole could eat it. (Assuming Hawking radiation does not exist)

The crits were dismissed because LHC is working.

They're addressing that:

> Those produced by cosmic rays would pass harmlessly through the Earth into space, whereas those produced by the LHC could remain on Earth. However, there are much larger and denser astronomical bodies than the Earth in the Universe. Black holes produced in cosmic-ray collisions with bodies such as neutron stars and white dwarf stars would be brought to rest. The continued existence of such dense bodies, as well as the Earth, rules out the possibility of the LHC producing any dangerous black holes.