Even if that is true, it does not explain why, unlike with Prince Phillip, some are going to be wearing military uniforms and some are not. It definitely does not explain why Andrew reportedly is being given an exception and Harry is not.Except that it's my understanding that in the UK, veterans don't wear their uniforms for public ceremonies. So, neither Andrew nor Harry should be wearing their uniforms since they lost their honorary military appointments when they stepped away from being active working royals.
It looks bad. It looks bad to give Andrew an exception given the reasons he is not working. It's like saying that behaving in the abhorrent manner that Andrew did is not nearly as bad as Harry wanting a smaller public role, to protect his wife and children, and to respond to media reports (that largely come from the palace). It looks like a vengeful and petty attempt to hurt Harry and to use the Queen's funeral of all things to do so.