Questions about Kaiser Baby Little Sheepy

Someone else wrote that according to Kaiser it should be compatible with every chair /seat with the size 0.

According to our research: Suitable for carrier bags and all Gr. 0 seats. It fits all harness systems, thanks to its longitudinal slot, it can be attached quickly and easily without long threads and without unscrewing.

According to Kaiser yes should be compatible with every chair /seat with the size 0