Scalzi's blog post seems to be just saying "There's nothing wrong with publicity", which seems true but obvious to me.
Traditionally, there have been two types of sales: ones that involve you personally, usually small numbers at events or via individual conversations (I'm fine at this) and those which are done through marketing that doesn't directly involve you (I'm terrible at this, as I have no skill in maths, statistics etc). Above a very small sales level, most sales would be done the second way.
What the article seems to be saying is that now, an author (especially a self-published one) is expected to sell books to anonymous people but through their own personality/performance/whatever the word is. I can (sometimes) persuade one person to purchase a book if I speak to him directly. I don't have the time or the skills to persuade large numbers of people to do that via my antics on Tic Toc or the like.
Agreed on the focus of the article. Social Media, and the article, deeply focus on and incent the viral spike while either ignoring or denigrating the slow burn. As much as US culture currently spotlights the, Rise and Grind, mindset, the focus isn't about slowly building a pyramid, block by block: it's building to a tipping point where you go viral (while also celebrating a deeply unhealthy addiction with workaholism)
Hugh Howey was great about engaging readers and "personally" engage with readers to build a base (leaving behind that Wool came out over a decade ago in a very, very different self-pub landscape). I stumbled upon Wool very early, loved it, and left a rating on Amazon. He sent a quick, Thank you--what'd you like about it? I'm sure it was a copy and paste thing he did every day but it absolutely got me. I went from leaving a rating, to leaving a review -- I was listening to Nicolas Jaar and commuting on Boston' T while reading on my kindle and mentioned how the music really added creepiness and atmosphere to his book in the review. He again responded-- Wow, cool, I'll have to check that out. A week later he
again responded and said, You're so right, that's super cool, thanks for sharing.
He used Amazon to personally engage with readers. From generic copy+paste --> Individual response --> Unprompted addition.
I get that's not possible for everyone (or maybe even possible anymore, via Amazon?) and that engaging with fans can be different for men and women, but, it's stuck with me as an engagement method I could handle.