That's ridiculous, frankly, and comes from the same school of thought as all those threads on Mn where someone's SIL is blamed for a family estrangement because it's easier to blame the non-blood relative or go with the 'he was led astray by a conniving woman' than acknowledge that your brother just isn't that bothered about staying in touch.
Only it's obviously madder when the poor led-astray man is not your brother, but a random royal you've never met, who himself comes from a family that is spectacularly dysfunctional by anyone's standards!
And no, I don't think Prince Harry marrying someone from the frankly murky world of white landowning Zimbabweans, whose father had one of Mugabe's longtime righthand men as a 50% business partner in his safari business, not to mention being linked with the illegal export of rhino horn and alleged to have held onto his land by funding Zanu PFF, would have provided Harry with a 'strong, functional, loving family' or been good optics for the RF.
I mean, the last queen stripped Mugabe of the knighthood she'd given him because of human rights abuses under his regime and rigged elections, and he took Zimbabwe out of the Commonwealth as relations deteriorated.
Things would only have been even messier if Harry were married to someone whose family wealth was based on funding a regime notorious for human rights abuses, and whose father had strong links to a dictator and his party at a time when Zimbabwean relations with the UK were incredibly hostile. Do you not remember all the publicity around Peter Tatchell trying to do a citizen's arrest on Mugabe, because his regime persecuted gay people? (In fairness, like a not insignificant number of other Commonwealth countries.)