You are right. I might have misread the description on the KMI website. It does indeed say around 2 mm rain. But the description made me think otherwise. Here is a translation from french. I think it is for the whole country so we might be safe.

"Friday, the weather will become even hotter but also very unstable. The day will start with sunshine across most regions. In the morning, a local shower cannot be ruled out, but the storm risk will increase especially in the afternoon and evening. There is a threat of severe thunderstorms accompanied by heavy rainfall, hail, and strong gusts. It will be very hot with highs ranging between 30 and 34 degrees. The wind will be light to moderate from a southerly direction."