AFAIK this is true if you have the various 'plans' on your personal (yellow) card, which comes with additional cost. The 40% discount is there with one of these https://www.ns.nl/en/season-tickets/
For ease of use, you could also hide a fuel pump switch inside the car that you have to press before going. It's an easy but effective solution for protecting your car and needs basic tools / wires.
Of course, the important thing is making sure the wiring is well done (proper wire gauge) and the switch is actually in a hidden spot.
Another item that I've seen gone from Ventura is the toggle to enable a low-power mode in the battery settings. Now, either you have always enabled when on battery, or not.