The figure from the above website is wrong. US$800 per month is in the upper middle-income territory but Kenya is still a lower middle-income nation.
https://qz.com/635952/kenyas-goal-of-being-an-upper-middle-i...
Kenya's GDP per capita was around $1143 or less than $100 per month in 2016. "The average monthly wage in Kenya is 6,498 shillings ($76).", according to Reuters in 2013.
https://tradingeconomics.com/kenya/gdp-per-capita
https://www.reuters.com/article/us-kenya-reform-idUSBRE94R0M...
This means that the basic income ($22.5 per month or ~20-30% of national median salary) to be provided to Kenyans should account for a substantial part of their income and the experiment could become a basis for an analysis of basic income effects in certain communities.