You're making an extremely pedantic distinction, which is only correct in a purely technical sense. Which is the worst kind of correct.
Yes, mastering engineers work from track-level dynamic range (usually achieved with slow-response compression) to transient-level dynamic range (fast compression/limiting), and the range in between. When the context for this discussion is about "brickwall limiting", we're talking about very fast, transient-level compression, and your comment mistakes slower dynamic range for the transient-level dynamic range everyone else is discussing.
So, no. In this context, what you're talking about isn't increased dynamic range.
Yes, mastering engineers work from track-level dynamic range (usually achieved with slow-response compression) to transient-level dynamic range (fast compression/limiting), and the range in between. When the context for this discussion is about "brickwall limiting", we're talking about very fast, transient-level compression, and your comment mistakes slower dynamic range for the transient-level dynamic range everyone else is discussing.
So, no. In this context, what you're talking about isn't increased dynamic range.