My worry was that the 3D workflow would be different in older courses
This is a common and valid concern. You can trust that at CGC we will retire content that is truly obsolete either A) based on such an old version of Blender that it’s too difficult to follow or B) taught techniques and workflow have been made obsolete by new techniques/workflow.
As often as CG / Blender updates and new tech is invented, it’s surprising how little the core workflows have changed in the past 10 years I’ve been doing CG.