Very few tbh. It's a very small club anyway, most of the traffic in the gym comes from personal trainers with "bootcamp" style classes.
The owner / head coach has a long career of coaching weightlifters, and also right now we have some Dutch record holders (admittedly, a very low bar). I think he's pretty on point, although maybe a bit old-fashioned. Also, he's very focused on safety & "healthy" lifting ("lifelong lifting" he sometimes calls it), which I actually like, but it may also be the reason there are not many really big lifters there.
Regardless, weightlifting is just so small in the Netherlands that I don't think you will find any club where there are a lot of people putting up big numbers. Maybe some CrossFit gyms, but coaching and (average?) level of technique will not be as good, I think.