Israel's current birthrate has more to do with the ultra-Orthodox and Arab communities and nothing to do with the kibbutz system. The ultra-Orthodox communities are also exempt from those "excellent contributions even in the military". While female ultra-Orthodox participation in the workforce is around 80%, that's largely due to males not participating (50%).[0]

0. https://www.timesofisrael.com/haredi-mens-employment-growth-...