Why would you call colocation "building your own data center"? You could call it "colocation" or "renting space in a data center". What are you building? You're racking. Can you say what you mean?
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The cynic in me says this was written by sales/marketing people targeted specifically at a whole new generation of people who've never laid hands on the bare metal or racked a piece of equipment or done low voltage cabling, fiber cabling, and "plug this into A and B power AC power" cabling.
By this, I mean people who've never done anything that isn't GCP, Azure, AWS, etc. Many terminologies related to bare metal infrastructure are misused by people who haven't been around in the industry long enough to have been required to DIY all their own infrastructure on their own bare metal.
I really don't mean any insult to people reading this who've only ever touched the software side, but if a document is describing the general concept of hot aisles and cold aisles to an audience in such a way that it assumes they don't know what those are, it's at a very introductory/beginner level of understanding the OSI layer 1 infrastructure.
I wanted to start off with the 101 content to see if people found it approachable/interesting. He's got like reams and reams of 201, 301, 401
Next time I'll stay out of the writing room!
Yes, building a physical DC is much wider scope than colo. This is one part of that, which is also still interesting. The world is built on many, many layers of abstraction which can all take lifetimes to explore. There are non-devs who enjoy learning about software, web-devs who dabble in compilers, systems programmers curious about silicon, EE's that are aspiring physicists, who in turn peek into the universe of pure path (cue yes, that xkcd you're thinking of).
A 'full stack' overview of a standalone DC build still has to set a bound somewhere. This was an approachable intro and look forward to reading more from the layers you operate.