Actually, it is a bigger story than you realize.
She got the jewels as an official gift which means they aren't really hers. She gets to wear them, exclusively, as long as she is a working royal - which was fine back in late 2018. At the time that she wore them, the Saudi government was in the news for their role in the death of a well-known journalist, so had the provenance of the earrings been known it would have made headlines as some sort of signal that the UK government was supporting the Saudi government. That is why the only information given about the earrings was that they were "borrowed." And when she wore them the 2nd time, the next month, and the KP officials said something to Harry about it (probably along the lines of "this could get dicey if word gets out who the earrings are from"), instead of recognizing that this was a potential diplomatic incident brewing, Harry "was incandescent" - and, reading between the lines - he wasn't mad that KP had maybe let them step into said potential diplomatic faux pas but that KP was warning H/M about wearing the earrings again - in other words "Meghan will wear whatever she damn well pleases, thankyouverymuchgoodbye".
You are free to have your own interpretation of what has been reported so far and claim it's a tempest over nothing. I'm free to have a different view, which I clearly have based on the additional context provided in The Times article that was being quoted in the thread with regard to KP sources basically talking off record ahead of the Oprah interview to make sure their POV of their dealings with H&M are out there. YMMV.