The grey-to-grey and black-to-white transitions count almost nothing in real world use, while the second counts very little....color transitions take way longer than that, around 20ms, I hate to repeat myself again and again, do you realize you're even contradicting the same info on the article you mentioned in the link?
It is possible that the very lastest LCD tech has been improved further (like maybe Pimax's adopted CLPL) but I really doubt it is anything lower than 12-15ms because liquid crystals take time to move, it's just their physical limit, there is no continuous pixel refresh like organic leds, they just STAY ON and transition to another state when the pixel need to be changed.
Do you play your VR games in black and white or grey scale ? Of course not.....so....
Any other advertised thing is mostly marketing mumbo-jumbo, and Nvidia G-Sync or AMD Freesync has nothing to do with what we are talking about, these are only methods to sync the graphic card frames to the monitor refresh better, wihout losing or skipping frames and causing what is called the "tearing" effect, that most people can notice playing with V-Sync off.
In fact, many gaming monitors are just normal monitors with some added software algorithm (Freesync) or a chip doing the sync to the GPU (nvidia), ridiculously overpriced, and with many negative features, like for example huge light leakage from the LCD backlighting, and lowest blacks of the category, still....they are sold like being "premium" things (almost a scam, believe me...).
Inform yourself better, don't just repeat what you read on the announcements, advertised sources, and paid reviews, companies are continuously trying to push their products by just telling partial info or plain nonsense, to trick the users into buy anything, convinced their product is better, when in fact it is NOT.
I'm not saying that OLED's are the display eldorado, but are well known to be better in almost anything required for VR displays (higher TRUE refresh rate, more vivid colors, real deep blacks, no need to use color filters or backlighting etc.) even that....there is much disinfo on that technology too, and these are kept artificially limited because otherwise it would become a too perfect technology and any other product would no longer be possible to sell, just know this, and LG upcoming high density micro oled will even render the screen-door effect these display commonly suffer almost a thing of the past, with even higher refresh rates.