No, Inno Montessori is not the only pure AMI Montessori preschool in Singapore. I believe they are childcare.
From what I heard, it’s not a great place for teachers to work in. If the teachers are not happy, I doubt the school will be a productive learning environment for children.
The following are pure AMI Montessori preschool:
1). Lodestar Montessori (preschool & elementary)
2). Montessori for Children ( 18months - 6 years & ( branch in the East & the other one in Newton)
I hope you find this useful.