Earlier quoted context omitted.
At best, what you're describing seems like a skill issue with the people describing it. Using multiple different metaphors that imply the thing you're saying is unrelated (mind's eye , visual ization, image, etc) is just bad communication. I'm not making any argument for or against your hypothesis that everyone can actually do it but might just struggle. I just find it pretty confusing to even understand what anyone…
At the end of the day, it's the "Is your green my green?" question and is unknowable. You cannot describe something that someone lacks or has a substantially different subjective experience with, truly. The best we can do is show that the effects of your seeing green are the same as mine (biologically, behaviorally, etc). If you're curious about the broader subject, would highly recommend reading An Anthropologist on…
It sounds like you're equating the comment I responded to with a question about colorblindness is a skill issue. I'm guessing that's not what you're actually arguing, but it's not clear to me what the actually analogy you're trying to make is.