I honestly find it funny that the ad says "Johannesburg" but shows Table mountain.
I find the latency good -- Low Time Delay Connectivity
A direct connection to the South Africa's data center is cheaper than an international connection to Europe. Additionally, latency can be reduced by 85%.
South Africa is undoubtedly the gateway to sub-Saharan Africa, boasting the most modern and extensive infrastructure on the continent. South Africa also has Africa's largest submarine cable system, as well as the most advanced ICT infrastructure. Deploying in South Africa not only serves the local market, but it also benefits the whole region. Huawei chooses to build a data center in South Africa to provide Huawei cloud services to customers throughout Southern Africa and further field.