Yes, to potentially 2k a year in passive income: "I am hopeful that in a couple of months this might lead to a passive income of $100-$200 per month for a while."
And the author acknowledges it may come to an end: "...perhaps some of the technologies mentioned will update substantially and my book will no longer be up to date"
Also the author doesn't see the money, but only their royalty (after the initial advance is covered, which it hasn't yet)
For some people, yes. Daniel Vassallo and Gergely Orosz are two people who I respect that started with a similar thing and have now turned writing/products into their full time job.
However, it feels like OP is just visiting. A lot of talk about "I could do this next" and a focus on FatFIRE. Daniel and Gergely just went all in and created a lot of high quality content.
And the author acknowledges it may come to an end: "...perhaps some of the technologies mentioned will update substantially and my book will no longer be up to date"
Also the author doesn't see the money, but only their royalty (after the initial advance is covered, which it hasn't yet)