Denis Karuhize Byarugaba is one of the Fellows of the Uganda National Academy of Sciences. At Wikidata we know about papers that he wrote, we know this because of the author strings that point to him.
One of the Scholia tools allows for the disambiguation of these papers by linking to the Wikidata item. It is important that we do because in this way we build on the existence of African scientists on Wikidata.
That is the theory, the practice is that it is increasingly cumbersome to even try to add papers because Wikidata more often than not informs about Too many requests. When this happens occasionally it is fine but when only 10 percent of the requests is honoured, the tool is effectively dead.
Wikidata is the most promissing tool of the Wikimedia Foundation and there is as far as I know no path forward. Obviously it affects people in what they do it affects the projects that are not progressing as fast as they could or should. Even when there is a notion of improved performance it is easily missed because of the pent up demand for much more power. Power to query and power to edit the data. We are not sharing in the sum of all knowledge when it is this hard to make it available.