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Why are you asking 'is this allowed'? This is a news website, not a board game.. You should be asking 'is this interesting to me or to other HN readers'. And in my opinion the answer is yes.

The video alone looks cool enough to share...

Uh...aren't a lot of "Show HN: [my app/startup]" commercial postings in nature?

Yes. But I have to admit I was disappointed to see this was just a marketing link for a book considering how much the title sounds like an article or tech blog post.

I think the title could be a lot more clear that this is just a link to info about a commercial book and not a link to traditional web content, though in this case the title is so long I'm not sure how they could have conveyed that well.

Yep. looks like Spam to me. Smells like Spam to me. Flagged as Spam.

Not spam. Neither Jim nor I (Eric) posted this... I'm not sure who did. You need to check your sniffer ;)

I call spam anything that is in my news feed but ask me to buy something instead of informing me. Sorry if you took it personally.

Ironically, i wouldn't call spam if done by you (assume the authors) with the "show hn" shenanigans...