Arguably, more dangerous and harder to navigate than vacuum.
But there are so many more fundamental problems with the high altitude Venusian colony idea that you would never get to the "temperature gradients > power" pipeline implementation in any case.
I mean right off the bat, imagine building or navigating anything in hurricane Katrina. Then, since we're talking 50km, imagine winds that would make the forces you're dealing with an order of magnitude more problematic.
Yeah, in terms of knowledge and technology, mankind is just not there yet to be perfectly frank.
https://www.morningstarmissions.space/samplereturnmission
https://science.nasa.gov/mission/davinci/
Of course anything could happen with funding in the next 5 years that would derail these.
OTOH, because wind velocity is highly tied to altitude on Venus, wind farming could be an important source of energy generation (along with chemical generation for emergency demand). Drag a fan at a hotter, lower, higher-pressure altitude, and harvest the electricity. In fact, storing an excess of wind-farm energy as chemical energy could power the occasional need to steer away from vortexes.
If the problem of a chemically-inert package can be solved, floating inhabited stations could be feasible.
I expect that a more boring approach would prevail: solar panels. No need for impossibly tall airships to resist wind shear just so they could get at both sides of the hot/cold setup for operating a sterling engine.
Engineering sense aside, I still wanna know if nature would allow the geothermal approach. Something about the idea that a column of air at rest would settle down into such a disequilibrium that it could be harvested of energy in this way feels wrong to me, but I've been unable to muster the thermodynamics chops to align my head with my gut.