Well happy to share what I know about him, but note that although I do follow the sport, I'm not in contact with elite athletes nor I know people from the t&f world. So take what I say with a grain of salt : )
To answer your question, he hasn't. He's been with his current coach (Gabi Lorente) for two years more or less, maybe a little bit more. After he ran 3.38 or 36 I don't remember, Katir contacted him and told him that he would like to work with him. Then they started to work together.
An interesting thing is that his coach is very young and quite new to professional-full time coaching. He's around 32 and has been coaching full time for 3 years more or less, from what I know. He coaches Mariano 'La moto' García (800) as well, and I don t know of any other international athlete he might be working with.
Regards