If you are born as a creative person, like Bukowski, you will create this time and space, no matter what. For the rest of us, Cleese tells us about the importance of creating them - while Bukowski warns that they're just a tool, not a solution. Likewise, you buy a set of pencils because you have an urge to draw; not the other way round.
Creative and Not Creative is just a mindset. I don't believe you are inherently one or the other. Either you accept things as they are, or try to make something new.
Bukowski is talking about something different. Cleese is talking about how to get into the creative or 'open' mode, whereas Bukowski is talking about people who use their circumstances to justify their lack of performance. Cleese only suggests an hour and a half a day of alone time which is completely doable for even for many people who have a job and a family and the drive to create something.
[1] http://zenpencils.com/comic/97-charles-bukowski-air-and-ligh...