If it looks too good to be true it probably is....... seems to apply here.Autodesk's own name for a similar product is 'Product Design & Manufacturing Collection'. It is circa £2500-£3000 a year.
Read the text at software shore very carefully:
What is the Product Design & Manufacturing Collection?
The Collection is a powerful set of applications that integrates extended functionality into Inventor and AutoCAD for engineers designing complex, customized products, equipment, and systems.
I have emboldened the crucial phrase. It sounds like you are buying add-ons for existing products that you license. You are unlilely to be buying a license for Fusion or Inventor themselves.