F-16C and AIM-9L slaving using HMD. Historically accurate?

Hello,

Firstly, apologies if this is the wrong section to start this discussion. This is my first post here and I am not good at historical research (which is also why I am asking for help).

What evidence is there to confirm that the F-16C Block 50 can slave the AIM-9L via its helmet-mounted display? From what I can find it seems as if this was a much more recent capability with the AIM-9X and not the AIM-9L. If this is the case, the mechanics currently in the dev server are not historical and it could give the developers a reason to consider adding the AIM-9M (without the HMD of course).

Sources:
https://web.archive.org/web/20080302193212/http://www.af.mil/news/story.asp?id=123088345 The article mentions that the pilots of Kunsan AB were able to use the JHMCS with the new AIM-9Xs they received. If the earlier variants of the sidewinder were compatible with JHMCS why would they bring this up?
The same goes for the next source: Boeing Images - Boeing Joint Helmet Mounted Cueing System - JHMCS I understand this is just Boeing images, but they only mention the 9X specifically?

I then thought about whether it was possible that they integrated the same system used in the F-4 Phantoms (VTAS Helmet) in future aircraft?
VTAS helmet VTAS/Helmet Interface SAFE Association But this source says that the system was only integrated to F4J and N aircraft.
F-16.net - The ultimate F-16, F-35 and F-22 reference This source states that the helmet-mounted cueing system was only implemented in the F-16C Block 50+ but does not describe how the system interacts with which missiles.

Thanks for reading.

I think that the HMD addition is an attempt to compensate the F-16C without giving it anything better.

AIM-9M is the only counter to R-73

Slaving the 9L was possible , probability never done with HMD as by that time 9M was the main guy .
It was also could be slaved using HOTAS