Hello Pradyumna
This is explained in the Phase 3 section of the following lesson:
A an NHRP traffic indication is simply an NHRP redirect. The full term used by Cisco is “NHRP redirect traffic indication” as can be seen here in the following CIsco documentation:
Yes, this terminology is somewhat confusing when in the debugging it is not made clear. So wherever you see “traffic indication” you know it means NHRP redirect.
I hope this has been helpful!
Laz