each tax means a new adviser
That is evidently untrue and I doubt they want to tell us that French companies need 300+ tax advisors. Yes, more taxes can mean more complexity. So do more laws, more employees, more customers or more product lines.
This is a completely pointless truism than does not prove anything.
They just claim that it’s bad without anything substantial to back it up.
The statement that you can raise the same tax revenue with fewer taxes shows that they don’t understand why different taxes exist in the first place.
Also it conflates taxes, fees, social security contributions, all of which may follow different legal and budgetary rules.
I may have overlooked it, but I did not see a single chart nor any mention in the text addressing the tax burden for an individual worker.
Which would be a far more meaningful discussion that the pure number of taxes.