To be fair, the scientists that wrote the scientific article came to no such conclusion. The "most likely uninhabitable" thing is an invention of the popsci jou

To be fair, the scientists that wrote the scientific article came to no such conclusion. The "most likely uninhabitable" thing is an invention of the popsci journalist whose article was linked, not something supported by the underlying journal article. The journal article asked the question "is the carbon transferred from Titan's surface to its ocean sufficient, on its own, to sustain a biosphere?" to which their answer is "probably not". It explicitly does not claim there are no other sources of carbon in the ocean, nor that Titan is "probably uninhabitable".