Do you have a link to an official investigation/report on this?

I don’t have a primary source handy but there’s tons of news reports. The Côte d’Ivoire crash was in May 2020.

I’ve looked at the news reports and as far as I’ve seen they only reference social media posts which seem to be inconclusive.

You seem awfully skeptical about this; there are photographs of burnt debris consistent with rocket debris, claimed to have fallen in the places where debris would likely have fallen based on the tracking of the reentry. Occam's razor would suggest that this is likely the explanation - there's no extraordinary claim being made.

I guess it would help if you let us know what alternate theory you have here. Are you thinking that it's a hoax? Or that the debris and the reentry at the same location of the debris are likely to be unconnected? Are you Just Asking Questions?