You could go with the interpretation that the author was wrong... but only if you don't realize most of the world interprets them as the same game, and as far as history of the names, they ARE the same game. Only a few specific places like England call an obscure game no one else plays as a separate game. Like with Amer. Football, the rest of the world means soccer. Except in England, billiards IS pool. https://www.mentalfloss.com/article/582807/whats-difference-between-pool-and-billiards
