What Does It Mean?

You are correct!

From our dictionary:
tan•gen•tial

(tan•jen'shul),
adj.

1. pertaining to or of the nature of a tangent; being or moving in the direction of a tangent.
2. merely touching; slightly connected: tangential information.
3. divergent or digressive, as from a subject under consideration: tangential remarks.
4. tending to digress or to reply to questions obliquely. Also,tan•gen•tal (tan•jen'tl).