Here are my ideas based on the clues and what
@mach10 has said.
I've
shared a spreadsheet that shows my workings. I believe the code should be broken down in to three sets; numbers, capitals and lower case letters. The image's left hand text is rotated so I rotated the right hand text the same way. This makes it a bit more readable and I can make out a few words such as plei(d)e(s) but I don't have a method of filling in the (d) and (s) so it's probably a red herring.
I think to solve the puzzle you need to move through it in a similar way to the SRYERBEEACDCIAAEJXDF0 puzzle. But where do you start and what is the pattern? Maybe this is what Mach10 meant by "concentrate on the numbers". It also appears that it took Mach10 a while to work it all out even when it is said to be a simple puzzle.
“In quoting others, we cite ourselves.” — Julio Cortázar
What does this mean? Well, it suggests that we only see/read/remember what we want to. But what does it mean to the puzzle? It appears that the penny dropped on this clue for Mach10 so maybe we should consider it in a different way? Eg. Could "Quoting" refer to characters in the puzzle which we require to work it out? Does it mean that using the left hand text allow us to work out the right hand text? Working out the cypher was too easy but maybe we need to use the encryed text to work out the rest of the puzzle?
What's with the left hand text being in the handwritten script? Is this a clue or just a way to make a simple puzzle not so simple?
Mach10 also said that it's in the numbers. I don't see an obvious pattern. I printed off the script on to two pieces of paper and overlaid them lining up on the pairs of the same number. I thought that maybe some of the letters would match up spelling a word but I got nothing.
Still working it out