The greenhouse effect described is more precisely a positive lapse rate that, as one descends into the very high pressures at the planet's surface, expresses extreme temperatures.
The greenhouse effect is the entrapment of insolation due to gases behaving like a greenhouse obviously, and the paper mention it as well as use a global circulation model that takes that into account when they reproduce the phenomena.
"The clouds of Venus are mostly composed of H2SO4‐H2O droplets and are stratified into three layers (Titov et al.,
2018). In the upper clouds (56.5–70 km above the surface), absorbers of known and unknown composition are responsible for the dark markings observed in ultraviolet images and for most of the absorption of the solar energy not reflected by the clouds (Titov et al.,
2018). The middle and lower clouds (hereafter, simply named
deeper clouds ) are within 47.5–56.5 km and importantly contribute to the greenhouse effect and the radiative energy balance. "
Since the current man made global warming that we observe has been politicized in mainly US and so one can see partial or fully misunderstood physics being expressed, it is perhaps not superfluous to remark that these global circulation model are used to understand current Earth, Archean Earth with different atmosphere, and other planets with substantial atmosphere such as Venus.
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