NEW BREAKTHROUGH on the IMPOSSIBLE EE / Unsolved cypher in The Giant

For all intents and purposes I have been going forward assuming that the Unsolved Cypher in The Giant https://callofduty.fandom.com/wiki/The_Giant/Ciphers_and_Scrap_Paper is important to solving Blundell's UNSOLVABLE EE. I justify this because it would be improper for the community to move forward on this infinitely ambiguous and ""Unsolvable"" Easter Egg if there is quite literally still an UNSOLVED cypher on the map, and it would be good either way to eliminate whether it is linked to the KN-44 Hypercube or not.

PROGRESS ON THE CYPHER:
Cypher transcript:

TheGiant
kCmlgFi6GUJNgkNl1Q41fbfyLoCFTCvlqkZil0KlAXAzP1U1uy1BE4UfPBfpKmmL0bjYnQNRBaPtKiVWzc5A4v0w3xle8F0hAGJZ7g4in0wndJxM0v03dc1M82at2T6935roTqyWDgtGD/hwwRF3oHqFM5Vcw1JtINbsgWRm4o4/quEDkZ7x1B275bX3/Fo1

The text itself has the hallmarks of a Base64 encoder, but notably it's missing symbols such as + . and letters that can be mixed up (0 and not O, I and not lowercase L, etc.) This suggests that a Base58 encoder has been used.

Using this tool https://appdevtools.com/base58-encoder-decoder the pasted text by itself can be decoded to the following:

yBR9CU2kuhzQ2NkvirkNxMeqw8TmFfpqzm1NbTNgg2zE95xmM88oK6FRP6WpGYHjdCMrMF6k1C6g27RhmeXKsxEdJBMdaDVqgBMeUZ13ZxuSyYRULNVRihejFLPt9trXhHRcqvzhdP9ak5KDfKGMJwyZ97FjZAJTsLod2otDYzzFzUKeKUqnUETFQEBxHWQ6yUtPr73coknZGMdRGUdKTstKnHTwFRmcc4LYjjQRcoFQUMH11MFwRNnckwJB7SboR1F2Fr

This is an incredibly good sign as the lack of "unknown symbols" (�) in the generated text indicates that the decoding was successful.

NEXT we have to find out what encryption method was used to generate THIS body of text, and keep in mind that TheGiant may or MAY NOT be used as a decryption key in the next step.

LEADS:
-ChatGPT seems to think the text format follows a RC4 Cypher format due to the type of characters and the possibility to use a non-restricted bit size for the Key (i.e. TheGiant can be used). BUT I have tried deciphering with https://www.dcode.fr/rc4-cipher and no luck so far.

-The Skite Innit video mentions the "Warden's Chessboard" puzzle and notably how the board can be interpreted as a message using binary. The Base64 decryption method can be output into 8-digit binary format, which fits the 8×8 chessboard grid and the Heads/Tails binary information the decrypter can provide. This could be interesting to try and synthesise if the Chessboard connection can be made properly (not sure there are such notable assets in game).

-Following the KN-44 naming logic, the Giant scrap schematic & Skite's conclusions, I looked into the Magic Series Hypercubes in the 4th dimension https://www.steckleyandassociates.com/magic-hypercube#:~:text=Magic%20Hybercube%20of%20Order%205%20and%20Dimension%204&text=This%20one%20is%20a%204,located%20cells%20sums%20to%20625 .
"This one is a 4 dimensional hypercube of order 5. It contains every integer from 1 to 625 arranged in a four-dimensional cube such that every set of 5 cells along any axis, or any diagonal, sum up to 1,565.  In addition, every pair of symmetrically located cells sums to 625"
Similarly to the Warden's Chessboard & binary outputs, it might be noteworthy to keep an eye out for Base64 outputs in hex or decimal for sets of data that may fit this pattern and thus complete a hypercube of certain dimensions.

-I've also tried rearranging the Magic Hypercube formula to use numbers like 935 or 115 for the Magical coefficient, and worked back to see if the dimensions given were correct or any important integers arise, and no luck so far.