Correct, the pedestrian walkway leads into the TIMON parking lot from the Anaheim Convention Center. When you get on the Timon tram from the esplanade, the Tram CM usually says something like: "This is the Lion King Tram to the Timon Parking lot and the walkway to the Anaheim Convention Center."*
And as gtrain219 posted above, at some point later this year, the Timon lot will be permanently closed for the DCA expansion project. My guess is right after the summer peak period, but that's a complete guess. At that point, I would bet that the pedestrian entrance/walkway would also close.
*This announcement always confuses me. Why do they call it the "Lion King Tram" and not the "Timon Tram"?