I strongly disagree.
The OP provided clear pictures of hardware. (I prefer links to sale site)
The OP described his hardware and software mods.
The OP described his problem. And provided Serial output too.
Ok, he had not realised that this display is write-only. (They designed it wrong)
So +1 to the OP for his question.
Post code, not links to code, not snippets of code,
I always prefer buildable code to snippets. But when you have a problem with a "library example" it is best to quote the "example name" and only describe and copy-paste "your changes":
e.g. pin #defines
e.g. constructor() statements
David.