From your link, it appears that the hydrocarbon claim was for Venus rather than an ice-cold blob like Titan.
From the link:
I offered a series of claims that naturally followed from the reconstruction. In science they are usually called predictions, but I prefer to term them advance claims. Thus I claimed that Venus, due to its recent birth and dramatic though short history, must be very hot under the clouds, nearly incandescent, and gives off heat—it has not reached thermal balance; that it must have every massive atmosphere; that the atmosphere consisted largely of hydrocarbons but that if oxygen is present petroleum fires must be burning—thus explaining also the present massive carbon dioxide content of the atmosphere; that sulfur and iron (ferruginous pigment) must be present too; and that if the same catalytic process that took place on the Earth when it was enveloped by clouds of Venus’ origin takes place in Venus’ own clouds, they must consist mainly of organic material infused with sulfur and iron molecules. Further, I considered that Venus was disturbed in its rotation.
They're everywhere!!!
Many of V's "advance claims" are slowly but surely being proven. I for one am glad he fought the good fight for all the years he and his work were maligned by the "scientific community". Such sleazy behavior from a seld-described group of those avowing the scientific method was, and still is, atrocious.