Does that take into account the hours when rainfall occurs or how could that number be so low? In a city with an average of 162 days of rainfall/year (according to climate.top, no idea how accurate that is). Apparently Amsterdam has 217 days of rain. Oooff. Been there a few times, can confirm. People still bike.
I vaguely remembered they used an assumption of 20 minutes commute with fixed hours. So yes, they were taking the hours into account.
My personal experience commuting 2 to 3 days a week is that I was soaked 4/6 times the past 2 years, slightly wet probably 15 to 20 times. I’ve chosen public transport once but rain was a contributing factor, not the key reason.