I've never viewed the African Natives in the attraction as savages, just like no one views the Native Americans along the Rivers of America as savages. African Natives are a culture that exists, and African Natives defending their territory is also a thing that exists.
I've always viewed the ride as, well, a jungle expedition- and in this case the tribe is defending their native land... which every civilization ever has done.
I can understand saying that the depiction isn't accurate and is therefore insensitive- whether that be the character design, costumes, the chanting- but to say having African Natives included at all is racist doesn't make sense to me.
Perhaps removing the 'attack' segment, and modifying the 'dancing' portion to be more accurate both in character design, set design, and costuming- and rewriting the script to not joke about that bit in particular could be a way to have traditional African culture represented in a way that's tasteful- like the Native Americans along the Rivers of America.
And the more I think about it the more I like my African restaurant replacing Tropical Hideaway idea- since I'm not a huge fan of Tiki culture and it'd be a beautiful extension of the Jungle Cruise, which is heavily inspired by Africa.
The Jungle Cruise isn't going to be able to effectively tackle a balanced view on colonialism and its treatment of indigenous cultures nor can overcome the appropriation for entertainment purposes.
Remember, the Noble Savage is still a racist trope. So having a comedic take on the adventure genre and then a noble and accurate representation of an African tribe isn't a good solution.
Luckily, it isn't necessary. The other 90% of the ride doesn't feature any natives. This one section can easily be altered to feature animals and nature or other elements.
I understand the attachment to it. I LOVED pile of skulls and headhunter concept. It was exciting and dark for me as a kid. But, I'm a white guy and I'm not having my culture constantly reduced to legends of cannibals' and spear chucking nor were these stereotypes used to oppress and dehumanize my ancestors.