Nope, drools [1] is a Java Expert System. It's fairly old now, but it's maintained and advanced.

Heck, I used PHP to interface with CLIPS [2] to provide a simple suggestion engine for a college project back in 2002. It had a simple wizard flow where it would ask a few questions, shell out to CLIPS for the next series of questions, do that for a bit, and return a suggested product.

1 - https://www.drools.org 2- https://en.wikipedia.org/wiki/CLIPS

They might be talking about Business Rules Engines which are elaborations of the Forward Chaining style of inference engine.

No tech ever really dies. Expert Systems are more dormant than dead. And, apparently, now being rebranded.