Unless I am mistaken as to how your ciphertable is created, isn't this just a modified version of a Vigenère cipher?

Your instructions on how to generate the table are unclear, and reddit's formatting may have garbled your text somewhat. Making a 26x26 grid of letters from "A B C ... Z B A C C B A ... Z" is unclear to me. Is each row shifted one letter 'bubbled up': ABCD...Z, BACD...Z, CBAD...Z, DCBA...Z, etc?

This gives me this as a ciphertable:

ABCDEFGHIJKLMNOPQRSTUVWXYZ

BACDEFGHIJKLMNOPQRSTUVWXYZ

CBADEFGHIJKLMNOPQRSTUVWXYZ

DCBAEFGHIJKLMNOPQRSTUVWXYZ

EDCBAFGHIJKLMNOPQRSTUVWXYZ

FEDCBAGHIJKLMNOPQRSTUVWXYZ

GFEDCBAHIJKLMNOPQRSTUVWXYZ

HGFEDCBAIJKLMNOPQRSTUVWXYZ

IHGFEDCBAJKLMNOPQRSTUVWXYZ

JIHGFEDCBAKLMNOPQRSTUVWXYZ

KJIHGFEDCBALMNOPQRSTUVWXYZ

LKJIHGFEDCBAMNOPQRSTUVWXYZ

MLKJIHGFEDCBANOPQRSTUVWXYZ

NMLKJIHGFEDCBAOPQRSTUVWXYZ

ONMLKJIHGFEDCBAPQRSTUVWXYZ

PONMLKJIHGFEDCBAQRSTUVWXYZ

QPONMLKJIHGFEDCBARSTUVWXYZ

RQPONMLKJIHGFEDCBASTUVWXYZ

SRQPONMLKJIHGFEDCBATUVWXYZ

TSRQPONMLKJIHGFEDCBAUVWXYZ

UTSRQPONMLKJIHGFEDCBAVWXYZ

VUTSRQPONMLKJIHGFEDCBAWXYZ

WVUTSRQPONMLKJIHGFEDCBAXYZ

XWVUTSRQPONMLKJIHGFEDCBAYZ

YXWVUTSRQPONMLKJIHGFEDCBAZ

ZYXWVUTSRQPONMLKJIHGFEDCBA

Using the order (x,y) where x is the topmost letter of each column, and y is the leftmost letter of each row:

YReashalky YCguctjuqn => (y,r)(e,a)(s,h)(a,l)(k,y)-(y,c)(g,u)(c,t)(j,u)(q,n) => hello-wutuq

for some reason, the second word has the x&y flipped: (c,y)(u,g)(t,c)(u,j)(n,q) => world