What else do you expect them to say, they have no other theory to replace what has been falsified because they wont accept the truth how water is formed - even if they are discovering left and right by this process?
http://www.space.com/27377-moon-water-origin-solar-wind.html
http://www.space.com/24422-solar-wind-makes-water-star-dust.html
http://web.gps.caltech.edu/~phayne/diviner/cwatkins/Moses_watersource_Icarus_1999.pdf
But now refuse to apply that process to comets, because it would go against their 200 year old theory they they have spent so much wasted time developing. Regardless if comet material samples have never shown any water and instead shown only silicates. No matter that every comet surface was hot and dry. No matter that every comet that disintegrated never showed a drop of water from the "hidden" ices in the core.
Comets are the acid test of formation theories - if you accept your comet formation theories are wrong - you must accept your solar system formation theories are wrong - galactic formation theories..... It starts a ball rolling they do not want to start.
Because they don't want to be students in the coming paradigm shift, but want to retain the mantle of expert.