Don't be a dick. It's totally normal to be skeptical and doubtful of some over-the-top claims. The onus is squarely on the person presenting the information to justify it. Your points about replication are accurate, but let's at least keep it to a pretext of civility.
The claim is not over-the-top at all though. They did a survey of funny RNA sequences in gut samples and didn't find anything that links them to known sequence from other organisms. Nothing spectacular was claimed.
