Yes, which is why I'm opposing putting it in those terms. Misrepresenting what happened to make it sound like what you want it to be is not OK
Except that that is exactly what happened. They had 15 seats, and now they have 20. The voters who gained them those 5 extra seats must have voted for other parties in the last election (or not been of voting age, but that's improbable given that PVV is more popular among older demographics).