I wasn’t aware of possible life on Venus. Thanks for pointing this out. I could catch up with the matter.
IIUC there is no known explanation for phosphine (in such abundance) on a rocky planet other then microbial activity…
Quite fascinating and exciting.
from SA:
“…high concentrations of the molecule phosphine—a stinky, flammable chemical typically associated with feces, farts and rotting microbial activity—in an atmospheric layer far above the planet’s scorching surface.”
So in summary, phosphine is not known to form abiotically in conditions like those present on Venus, but life also is not known to survive in conditions like those present on Venus, so biotic and abiotic theories are open for discussion.