I’m Arnau Bonan from Lynx Edicions

There is one picture

https://www.hbw.com/ibc/1550634

That you identified it as Grey-throated Barbet, but in HBW-Birdlife Checklist 2 this species was split and in Kenya there is Grey-headed Barbet (Gymnobucco cinereiceps)

https://www.hbw.com/ibc/species/grey-headed-barbet-gymnobucco-cinereiceps

We have changed it.

I am not sure the Kenya Birds Checklist subscribes to this split.  Anyway here is the picture for the record