Mark, I’m not familiar with the website you presented nor am I affliliated with it in any way.
That humans have access to metaphysical-1, mind/intellect/concepts is common occurrence for humans above a certain age ie metaphysical-1 = mind/intellect/concepts and all humans have, or will have, or lose their access to metaphysical-1, mind/intellect/concepts. sometime in their lives.
I can direct you to dictionary definition of metaphysical if that will help you to understand metaphsyical-1 has to do with nature of the mind.
I put the #1 after the word metaphysica-1 , because often times in dictionary, we will find two or more definitions associated with a word and you will see those various definitions enumerated in sequence, 1, 2, 3 4 etc.
Based on my past experiences with older book dictionaries, the words spirit and soul has more enumerated definitions than most other words. This is due to their definitions being vague{ lack clarity } from the get-go ergo they are used loosely by humans to reference this or that, or other.
By putting a number next to my word I’m making it known that I’m using a specific definition associated with that enumeration ergo there are other definitions that use other enumerations.
By having enumerations we can better clarify specifics of our concepts be distinct from other concepts that use same word. I also sometimess use italics with metaphysical-1, and again, that is make it distinct from other concepts that use the word metaphysical.
The word field is another that has various definitions and again dictionary uses numbers to make distinct the different definitions associated with that word.
I think I mentioned earlier that humans are always creating new words or combinations of words that are sometimes formally adopted into some dictionaries, or informally adopted by culture and maybe found urban dictionary.
These new words are created to help make a concept distinct from another concept, that may or may not be similar. That is what words do.
Humans created dictionaries for reason. To make add clarity to our communications.
Metaphysical-1 = mind/intellect/concept ergo my comment presented it in just that way.