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I mean, isn't it just Android?

I thought the same and looked it up - nope, apparently not Android based

The HarmonyOS on current Huawei devices is still Android-based. They've announced a new system "HarmonyOS Next" that'll supposedly drop Android compatibility for real this time https://www.pocket-lint.com/huawei-harmonyos-next-coming-soo...

no. apps on android are not compatible. they have to rewritten in order to run on new os.