It is, however, still I'd suggest more likely that this is, indeed, another process that we are not yet aware of. There's something exciting about a discovery of something that is not explained by our current understanding (which this is, if the measurements are accurate), but there are a lot of spots where our current understanding may be incomplete. The key point is this: our possibilities are more realistically "life in a form we don't currently really understand is on Venus" or "some other process that is not biological is there that we currently don't understand". The latter can cover a lot more parameter space, and the Discussion leads off with acknowledging the lack of information. They would be remiss if they hadn't talked about this as a possibility, but that doesn't make it the most likely one, even if it's the only possibility that's more formulated at this point.