Their implication is that junior devs have more likely built up their workflow around the use of AI tooling, likely because if they're younger they'll have had more plasticity in their process to adapt AI tooling

Overall I don't quite agree. Personally this applies to me, I've been using vim for the last decade so any AI tooling that wants me to run some electron app is a non starter. But many of my senior peers coming from VS Code have no such barriers