Is Vive's pension scheme a collective pension scheme for the self-employed?

No. The word 'collective' is sometimes used because all participants get the same terms and rates, but that is different from a collective second-pillar scheme.

At Vive every participant has their own lijfrente account in their own name. There is no shared pot, no redistribution between participants and no shared longevity risk. Your capital stays yours and moves with you if you switch. Read collective versus individual pension.