We don't know if it wasn't inhabited and we don't know if it is currently uninhabited.
Almost all "complex chemistry" that we know of involves hydrogen.
So to those people who say "but but but that's just life as we know it". No, it's also chemistry as we know it.
You are probably thinking of the reports last year of phosphine in the upper atmosphere where the quantity turned out to be overstated by a significant amount.
On the other hand, there is a sweet spot in the Venusian atmosphere where the temperature is low enough and the atmosphere provides enough protection from solar radiation that microbial life could conceivably survive (which is not the same as saying there is any life there); there are certainly plenty of Earth microbes that live in environments just as inhospitable if not more.
https://en.wikipedia.org/wiki/Venus_atmosphere
Hydrogen chloride 0.1–0.6 ppm
Hydrogen fluoride 0.001–0.005 ppm
If you knew anything about chemistry past checking wikipedia, you'd just call it none.