before giving your humble opionion please check the histroy with that script, and who said drm fix was not required in z5 ? the Method was alot easier then, it was Tobais script which propably made sony to change the DRM method because his script was so universal you can patch virtually any kernel on Android 5/6 & 7 covering devices from Z3 to Z5 and X/Xz family (until android7)
the tobais script later maintained by @serajr would like his opinion too
it not about going back few thousands posts or going back decades! , credit is credit!
as a sony user, you can always follow the trail back
for example why this post was closed! etc