That book opening image is indeed telling

But there is one other, probably even more important advantage: Prolog is a programmer's and software engineer's dream. It is compact, highly readable, and arguably the "most structured" language of them all. Not only has it done away with virtually all control flow statements, but even explicit variable assignment too! These virtues are certainly reason enough to base not only systems but textbooks on this language.

The 90s certainly were a different time...