It's ARM64 assembly. You change the right-hand operand to whatever you want (or change to a whole different assembly instruction that will put in w21/w23 the number of shiny rolls you want), use an ARM64 assembler (like
https://armconverter.com/ ) to get the bytes you have to put in the right side of the code, invert them (as the cheat code system is designed for numbers, not 4-byte instructions), and replace them in the full code.
For example, if you wanted 100 shiny rolls regardless of which bonuses you have the first instruction would be <mov w21, #100>, which converts to the sequence of bytes 950C8052, which when inverted becomes 52800C95. This is what you put in place of 531C6D15 in the code. You then have to do the same for the second instruction, which should become <mov w23, #100>, whose bytes are 970C8052, and inverted becomes 52800C97, which you put in place of 531C6D17.
This also works for the update 1.1.0 code, BTW.