The point of this book evades me. Is it a book about programming? Software engineering? Algorithms? Language theory? Who is supposed to benefit and what is to be learned from reading this book?
First of all, the semantics of the example language are obscure enough that I doubt it's transferrable to more mainstream languages (and its syntax is quite an abomination, but that's less important). I doubt understanding this language would benefit your average software engineer in using your average production language, whatever is the stage of the engineer's career this book is read at.
Worse, much of the implementation complexity is buried beneath the semantics of the language. For instance, the book demonstrates how to write a mutex or a channel, but it uses the language features like dataflow variables, and all the actual complexity is swept under the implementation's rug. This hides the hard parts—the very parts you'd need to understand if you wanted to implement similar mechanisms in, say, C or Java. So the book doesn’t teach programming in any practical way, nor is it about computer science in the Tanenbaum's books sense.
Then, this book attempts to be rigorous. But I'll just say that its rigor is nowhere near things like TAPL or "Semantics Engineering with PLT Redex", and neither is the clarity of the underlying formal model.
All the same applies to all other areas this book tries to cover. IMO it just fails to deliver on each front it tries to tackle, and it spreads itself thin trying to tackle all of them.
The only remaining point that's supposedly standing out is the unification of quite different paradigms under the same formalism. But, again, it's nowhere close in rigor to your average CS/type theory text, and TAPL does it better. And some extensions of the basic kernel example language feel artificial enough that I can't say the text achieves this aim even from the pedagogical point of view.
Your time is better spent reading TAPL. Or Tanenbaum. Or any of the myriad books on OOP (yes, they try to cover OOP and fail there too). Or Cormen. Or maybe even your favorite sci-fi book.
Ah, and the editing is bad. I get it, the authors aren't native English speakers (and neither am I), but I often found myself understanding some phrases either purely from the context, or from literally translating some out-of-place word to my native language and looking at homonymous meanings (lucky me! the authors' native language is apparently semantically close to mine!). But if I read a book (and not a blog post or an arxiv preprint), I expect the text to be smooth, even if it's a technical book.