You will still need the correct profile on the laptop to access the ECU even if you have Descpro and the correct lead so it depends which ones come with the Descpro install you get. There are lots of versions of Descpro and even more profiles.

That diagram above is totally wrong for what you need cable wise. You need a simple TX/RX/Comms Ground cable. (3 wires)

You may also find that the ECU is locked as well.

Good luck!