That number also includes CATIA from Dassault and Inventor and AutoCAD and all the other stuff from AutoDesk. Solidworks and F360 themselves are likely less than 20% of the overall market.
f360 and Solidworks are common in the maker communities/youtube/etc as they both offer free/cheap licenses to get started, so that's what you're mostly likely to encounter unless you actually work in the field.
When people think CAD, they think "making a 3D model of a teapot".
Whereas most of the dollars in that pie chart are spent on super specialist software that does things like modelling the electron flow through a 3 nanometer transistor... Or modelling people flows in an evacuation of a tunnel...
That data is the market reality. Nobody in business cares about 3d models of teapots, they're trying to build physical products and there's a lot more that goes into that process than the mechanical drawing of the end product.
There are some users who need to do things like electron flow, but the overwhelming use case is in fact product engineering and development. The other 80% of the people not using Solidworks are not doing anything weird, they just aren't using Solidworks for whatever reason.
When mechanical engineering teams think "CAD", they aren't thinking "CAD", but rather Product Lifecycle Management ("PLM"). The drawing tool is one part of a much larger system. Think the difference between Quickbooks and SAP.
Siemens NX is the big entry in this market. You don't hear about it because 3D printer users aren't making YouTubes about it, and because you probably don't work in the field.
This project is out of universities which in my experience usually have Solidworks licenses, plus some students using F360 because they were already using it before joining the university. I went to one of the author's universities (Tohoku) and indeed Solidworks was generally used there.
The animations look too good to me to come from such software though. Maybe they used blender.
