aterpster,
That is weird.
I obviously haven't seen the full set of plates.
Having done a short stint working for Jepperson's main competitor as a Small Chart Compiler and cognizant of who actually does this kind of work, maybe the answer to that question is, oversight?
The charts go through various stages of "checking" before final submission and maybe that plate got missed?
In terms of the physics, isn't the main reason for using a backcourse procedure for the MA here, because, tracking with accuracy is most critical early on in the MA procedure where you are close to the ground and when using a beam radiating from the location of the I-PKN, you gain that accuracy where you need it?
If you used a nav aid based on the position of LINDZ the converse is true, with your ability to track accurately getting better the close you are to LINDZ.