There is no question over whether or not age cheating happens at the grassroots level in Africa. It clearly does.
But what you said was there is a rich history of Nigerian players falsifying their ages for work permits [in Europe], in order to infer that this might be true for Victor Osimhen. This is not true as there is no such history.
First, unless you mean to suggest that Nigeria = Africa, I don't see why you're providing evidence of Camerounian age cheats and the like. What does that prove here, unless you mean to argue that all African countries are the same, so whatever is true for one is true for all?
Secondly, these are players who were all caught domestically either at local age-grade competitions or by their home federation, further proving that the likelihood of age cheats making it to Europe is close to zero since there is a pretty strong barrier to them even making it as professionals in the first place. I would imagine that top European clubs would likely conduct further due diligence with similarly advanced medical techniques.
In fact, it's an argument that sits on its own head. If there is such an issue with age cheating that it leads to such an extensive testing regime, wouldn't that instead suggest that a player who passes all those tests and makes it to Europe is about as certain as can be to be the age he claims?
Your comment about Osimhen was, therefore, completely out of place in almost every way. There is literally no history of a European club having proven issues with a Nigerian age cheat.