No, the (Dutch) page is online but maybe you were redirected to a non-existing English version (due to your browser language or location). Here’s a capture; click to enlarge.
I think the prices are per node, but MAYBE the prepaid can be used for multiple nodes? “Maandelijkse kosten” and “Kosten per maand” are cost per month. “Aantal per eindklant” is “number per customer”, and “buiten bundel” is when you exceeded the included numbers. “Activeringskosten per key” is activation cost per key, and “Eenmalige kosten” are one-off costs.
Well, Google Translate helps.