But in the RF it's never just about one person. For years maybe even decades Charles has been talking about sliming the RF primarily because it reduces costs and he knows that's a winner once the queen dies. If they extended titles to Harry's kids then that goes against the overall policy. The last changes that made Charlotte a princess were designed to change 100 year old rules to allow children of either gender become direct heirs. They didn't change at the same time to include great grandchildren (likely not included before because 100 years ago no one lived that long!).
From what I can see from her quotes in the interview - H&M asked for the titles to be extended, RF said no, H&M said but we need protection, RF said protection is only for titled members. H&M said but the risk isn't less because of no title (and arguably worse due to racism), RF said them's the rules. H&M said, that's not fair.
Yes a little jobs worth and yes very unimaginative regarding the potential goodwill in BAME community. But if they'd extended the titles and protection to Harry's kids, then next time Charles said he was streamlining the RF, everyone would say no you're not.
What comes over to me is that the RF are doing what they always do - looking long term at the institution, H&M are looking short term at what impacts them. Neither is right or wrong it's just two very different perspectives when it comes to decisions.