I don't know what I should think about the cine4home "special" about the JVC autocal.
Ok, it's good concerning what's basically possible and what's the result by use of the Spyder4 probe.
Referring to the X700 C4H has used, and regarding to my own X75 calibration experiences, I'm afraid, there is some detail information missed out concerning the effort of a total calibration. Using the JVC autocal SW I have to run color/gamma calibration in differend operating modes (CMD on/off, grouped lens aperture settings, lamp mode, wide gamut filter mode). I think, it's applicable to the X500/700/900 too. I mean, it wouldn't be very good, if the user change e.g. the lens aperture, and on screen suddenly happens a perceivable color temp shifting, because the PJ was switching over to an other data record for color correction (like the X55/75/95 is doing that). And I don't know any PJ, who's free of color shifting if the lens aperture is used.
And I think, the report is wrong concerning that the PC can be used as signal generator via HDMI. There is no word about in the manual of the JVC autocal SW V5 (and no update available). As far as I can say, the JVC SW takes only use of the PJ's internal pattern generator controlled by LAN.
So if a PC could be used as pattern generator, I think JVC would have noted in the manual some information about the needed graphic card setup (RGB/YCbCr, HDMI PC or video range, LUT dependency, setting up the PJ's HDMI input, and so on). And depending on the used GPU (AMD/NVIDIA), the result could be one way or another. I personally do not use the PC as substitution for the BR player signal.