@Ian DP if your coconut oil doesn't taste or smell of coconuts then it's been refined and is less good for you than the more expensive organic virgin coconut oil - which is only cold pressed from organically grown coconuts.
I love coconut oil and use it extensively in my cooking - it's very healthy especially the lauric acid which has many benefits.
I've seen the article you reference before and it's accurate.
Bulletproof Coffee was originally designed by Dave Asprey using MCT oil as that allows you to fully utilise the mechanism of the liver processing the MCTs - this feature would be reduced (less effective) using coconut oil.
I've tried both and found that with coconut oil instead of MCT oil I can't last past 11am but, with MCT oil instead of coconut oil I can easily reach 3pm before feeling I need to eat anything.
I want to try with the upgraded brain fuel - C08 Medium Chains but, can't justify that expense.