The title is "How to Acquire a Domain Name (That Someone Already Owns)"

But the article essentially deals only with how to contact the owner.

It doesn't deal at all with strategy or research required to acquire a domain name at a fair price.

Acquiring a domain name is much more than contacting the owner. It's how you contact the owner and what you say and even how you say it. And who you appear to be and a host of other factors. It's what your initial offer is (and while some will say don't make the first offer that is not always correct) and even how long it takes you to reply to a counter or how that is handled.

There is much to the strategy (on both buy and sell side).

And even if you are using an intermediary to make offers on your behalf you will have to use a strategy with them as well.