Uhm.... people have to remember just because 'I never saw X as racist' doesn't mean some other people or groups don't, especially if you are not of that group.
I think the whole 'Uncle' thing from the time the brand started was perhaps still associated with things like 'Uncle Remus', the kind of jocular, supposedly happy older male slave. No one is asking for Uncle or Auntie to be removed from everything - don't make up daft straw men.
I remember there being some unease about Uncle Bens as a brand even 20 or more years ago, so it's not a new thing.
It honestly does no one else from any other group harm to change the name, it's not damaging anyone's 'rights' or 'freedom of speech' but it may make POC feel like their concerns and sensitivities are being listened and responded to when they still so often aren't, so it's a thoughtful gesture.