The trouble I have with statements like this is that “as we know it” is doing so much of the heavy lifting. We don’t have any experience with extraterrestrial life so it’s difficult to imagine how different or similar it may be to our own. We have a sample size of 1 with a completely unknown population. The best we can do right now look at line spectra and make inferences from organic chemistry. But that tells us very little about the potential forms life may take.