If you've claimed you have earned internationally recognised achievements, then you would expect to find relevant information about you on the internet. If information isn't there, then they can base their decision on that. Their response says they will ask you to comment if they find conflicting information. If they didn't find any information, that's not the same thing.
I'd suggest you speak with a migration agent if you want to pursue this further.
186 visa - Temporary Residence Transition stream
Granted Dec 2013