What does the matrix mean in Four of Coins of Tyldwick?

[Vincent2024]

In the four of coins of Tyldwick, there is a matrix with 16 cells, and there are numbers in these cells. There is a circle outside the matrix with 16 cells,too, and there are celestial bodies and elemental symbols in them. 

The numbers in this matrix are: (the first row) 8, 9, 6, 4, (the second row) blank, 9, blank, 2, (the third row )8, 9, 5, 9, (the fourth row) 9, 3, 13, 0. It is clear that the numbers in each row, column, and in the forward and backward main diagonals, add up to different numbers, so the matrix is not a Jupiter Square.

I also found that the colors of each cell in the matrix squares correspond in order to the cells in the circle. The first cell of the matrix (8) corresponds to Jupiter in the circle, and the second cell (9) corresponds to Cancer in the circle, so on, with the last cell (0) corresponding to the blank cell at the top of the circle. According to this correspondence, the numbers in the matrix correspond to the planetary and alchemical symbols in the circle as follows:

8-Jupiter, 9-Cancer, 6-Capricorn, 4-Virgo, blank-Libra, 9-Progress, blank-Aquarius, 2-Air, 8-Water, 9-Gemini, 5-Fire, 9-Sagittarius, 9-Mars, 3-Capricorn, 13-Moon, 0-blank.

The author mentioned in an interview that he took inspiration from kaleidoscopes, geometry, architectural patterns, codes, and the languages of flowers and color.

What does “codes” mean? In the whole Tyldwick, it seems that only the Four of Coins is related to “codes”.

But what does this correspondence mean? Is it some kind of encryption? Why does the number 9 appear five times in the matrix? Does it represent a frequently occurring letter in a natural language? Why are there two blanks in the matrix?

[gregory]

It's a magic square:

 

[Vincent2024]

yes I read the hand book too. but I wonder what kind of magic square  it is and what do the numbers mean.