You are misunderstanding. Company is not equal to platform.
HIMA is not a formal company. When I say platform, it is like “Linux platform”, a framework that can be used by different companies (ie. Red Hat, Ubuntu, etc.), but the primary developer is the Linux Foundation.
HIMA doesn’t actually own any of those brands, so those but this chart is just breaking it out that way for people interested.
Luxeed is actually owned by Chery.
Stelato is also listed “twice”. The actual owner is BAIC.