Whether you use plan mode or not is orthogonal to whether or not you're vibe coding. "Vibe coding" means that you don't read or edit the code; you are running the software and iterating on vibes alone. That's the meaning since the original (and very recent!) coinage and hasn't changed.

If you're reading and editing the code, you're not vibe coding. If you're not reading and editing the code, you're probably vibe coding even if you feel "hands on".