That links to a company selling a retrofit system for 7500 Euro and no annual fees. That's super cheap compared to buying a new tractor and I hope they are successful. But...
My brother-in-law hobby farms a few hundred acres of corn and soybeans and built an autosteering system for his 1950s tractor. The only thing he bought new was an Arduino board to tie it all together. Everything else was used farming equipment and his total cost was less than $1000 (USD). He's not even a programmer, just an engineering degree from Flyover State U. He cobbled together open source software to make it work.
The traditional farmer is very resourceful. They aren't going to allow your company much margin if they can do even part of it themselves. Good luck to VC-backed firms.