He means a recursive resolver. A stub resolver is also referred to as a client, so it's clear from context. When you connect to 1.1.1.1 you're using DoT, but no

He means a recursive resolver. A stub resolver is also referred to as a client, so it's clear from context. When you connect to 1.1.1.1 you're using DoT, but not necessarily from the recursive to the authoritative.