Here's a link to the results and interpretation to that survey.
Market share seems to be interpreted on number of users alone, regardless of industry and regardless whether hobbyist or professional or whether on perpetual license, paid subscription or free.
I can see that within the "market segment", which heavily revolves around CAM that Fusion 360 is popular as it offers pretty mature and full featured functionality for very little money. Not a surprise result given the CNCcookbook site is heavily biased toward that clientele!
However in any real mechanical and machine design environment this is clearly not the case.
I started my career ~30 years ago designing manufacturing automation equipment. Nowadays my day job involves developing concepts for such automated systems. With Fusion 360!
In this sales related position (which I also held prior for 2 of the worlds largest automation companies) I frequently get to visit customers in very different industries. Usually these are organizations with 200+ employees and often much larger. The other 10 years I've done (odd) product design.
In the manufacturing automation industry Fusion 360 plays no role.
In most of the general manufacturing machinery industry Fusion 360 plays no role.
In fact I've not encountered a single customer who uses Fusion 360 in manufacturing or in product design.
In those areas SolidWorks occupies 90% of the market. The company I work for currently uses SolidWorks and 95% of "my" industry uses SolidWorks. The Automotive/Vehicle and Aerospace industry are dominated by CATIA.
I don't see that changing any time soon either.