It all depends on few things:
1. what type of coconut oil (if there is a research like in the link above) they don't say which coconut oil they used but most likely the processed one - very unhealthy regardless of species. The only coconut oil worth trying is raw organic virgin coconut oil
2. if your cat doesn't like it no point in giving to him by mixing with food as he might not want to eat it and of course if there is a problem with appetite don't do it. I give Rocky a tiny bit on the side of his dish and he happily eats it
3. if you want your cat to put weight on coconut oil will not do it as it is metabolised differently than other fats and actually promotes weight loss (but ECID so it might have a different outcome in some cats)
4. raw virgin coconut oil is an excellent antiinflammatory and antibacterial
I think the subject is worth further discussion so please chime in, it would be interesting to hear various opinions.
I, personally love coconut oil and give it to my pets.