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The above quotes are from Limiting the spread of COVID-19 in Africa: one size mitigation strategies do not fit all countries, the Lancet, April 28.
Further, the The Internet development in Africa is less well developed than in say N. America, Europe or E Asia. Further with the exception of the Republic of South Africa there are no hosts that PingER monitors in Africa that have high-speed research and education network connections. The hosts that PingER monitors outside of the Republic of South Africa are all on public network links. They are thus more likely to be impacted by changes in traffic patterns caused by Covid-19 interventions such as lockdowns, curfews, shelter in place, and closing of places of education etc.
Further investigation of the Republic of South Africa indeed illustrates how the high-speed Tertiary Education and Research Network of South Africa (TENET) changes the PingER IPDV responses depending on whether or not the host has a public or a TENET connection. See PingER and Covid-19 and the Republic of South Africa and the impact of High-Speed connectivity an illustration.
For the impact on PingER performance by world regions see PingER and Covid-19 by Region.