Satoshi's punctuation style with the double-space after the dot is a distinctive feature of his writing, used in both the official Bitcoin publication and on forum posts.
Looking at the HTML source of that review, you can notice this exact punctuation style.
https://news.ycombinator.com/item?id=2103480
Manjoo was wrong.
I don't. Every style guide I've seen has recommended against it in any medium that is going to be presented in non-fixed-width type, and IME its a lot less distracting to have single-space-after-sentence-ending-punctuation in a fixed-width font than double-space-after in a proportional font, so I've pretty much abandoned the practice entirely except in very narrow circumstances (e.g., I'll usually still do it in source code comments.)
I think I first started adopting this practice around 1990 (about the same time I was finishing high school.)
Since typesetting systems remove it anyway though, there isn't any reason to do it when using them.
https://www.national-preservation.com/threads/preserved-bars...
doesn't look like anything posted by "satoshi" on bitcointalk.org: https://bitcointalk.org/index.php?action=profile;u=3;sa=show...
I could never imagine the real Satoshi not capitalizing his I's and the first letter of every sentence. At least I've never seen him do that in other writings, even on forums like bitcointalk.org.