I dont doubt the economy is growing.
I too can't see where the news is: the economy has been growing for several years, and it is projected to keep growing for the next few years; is there anybody who is wide awake that needs to be told? (Is the growth sufficient for what the country needs? Is the the "wealth" being felt all around? Are Kenyans still begging for food? Those are other matters.)
At the same time we have to ask the regular guy, whether he/she is getting any benefits or just crumbs from the big fish.
According to Mr. Mwau, Kenyans are shopping at a "mall like Two Rivers" and also going to Dubai in large numbers. So, there you have it!
Oh, on the Dubai "proof", Mr. Mwau makes a hopelessly wild and fantastic claim that will no doubt be (and apparently has already been) swallowed by some, given its "authoritative" source:
Kenyans are the second largest visitors to Dubai, other than Indians.
A look at the airport there on a typical day should be enough to dismiss that one. A look at the government statistics of that country shows that Kenya is nowhere to be found in the list of non-trivial suppliers of tourists. Better go with just the "they are all at this fancy mall!" line.