That's basically normal for unconditioned factory spaces in the US south during the summer. Ungodly hot, ungodly humid, and generally just shit to exist inside.
This is in large part why historically industrialized factories tended to be concentrated in colder, higher latitude regions until the 20th century. Without refrigeration the work was far harder and more exhausting for the workers and that limited efficient use of labor.
I've spent a little bit of time in those types of spaces. I absolutely believe the temperatures referenced, but approaching 100 F with humidity above 95% is likely deadly in a short amount of time. And to then seemingly make jokes about selling tickets to walk into an area where you get physically stuck for mysterious reasons adds to my opinion that some of the report seems hyperbolic.
Check out the heat index page I linked above, or this similar one from OSHA: https://www.ohsa.com.au/services/heat-stress-monitoring/.
Tell me about it. I worked for 3M owned Saint Gobain running kevlar and fiberglass sheets thru 5-story oven feeds. it was often 105°F on the floor, but if you were unlucky enough to lose your line you'd be hiking up 5 stories of oven stacks where temps would be soaring. Not to mention every Friday PM shift would start with running junk lines super hot to "clean" (burn-off) all the accumulated Teflon in the oven walls and exhausts (which did not work efficiently enough) from the prior week. So, at 3PM you would start your shift already drenched in sweat watching as a Teflon smoke plume formed at the ceiling of the 7-story plant, like a dark storm cloud, and slowly make its way down to the floor. By 10PM we would all be coughing and exhausted, scratchy throats, etc.
A lady on 3rd shift who ran my machine had a near death incident and the company swept that under the rug along with plenty of other seriously concerning practices.
AMA!