I think this is absolutely fantastic for two reasons.

1. Children are encouraged to embrace their native language and culture, not disown it. It's well known that children learn from, and are influenced by, their peer group much more than their parents. This includes language and culture of course. Many children of immigrants refuse to speak their parents' native language because it makes them feel different and alienated from their English-speaking peers. Only later when they're teenagers or adults do they wish they had embraced their parents' culture and language and by then, it's a bit late. With this school's setup, kids are instead encouraged to embrace their native language and culture and share this with each other.

2. The teachers actually know something about multilingualism. There is a gigantic problem in the US with language disorder diagnoses in bilingual children. We know that native bilinguals start out by being a tad behind their monolingual peers, but quickly catch up and have the same abilities. However, most speech-language pathologists (SLPs) are not trained in bilingualism and consequently end up diagnosing a lot of bilingual children as having speech disorders when in reality most of these diagnosed kids are just still developing. Then these kids get put in special ed, fall way behind, have low self-esteem, and end up being generally discouraged with education. This is obviously not good. The situation is improving as more SLPs get certificates in bilingualism, but it's still a major problem. Here, with teachers being familiar with bi/multilingualism, hopefully these issues are lessened.

I hope this catches on to more schools because it's such a nice way to embrace multiculturalism and multilingualism, which is severely lacking in the US.