@RexNoctis I have that board “working” using @wineds example with a simple analog clock.
I don’t see where your code should display anything so its probably working! If not start a thread!
My thermostat code for the 2.1" version of this device is here in case it helps :
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Thanks all, especially wineds - your code is working on the display, thankyou! Now to work out why mine isn’t but it at least proves I haven’t killed the screen in my fiddling! I’m sure I can now work backwards and get my solar stats onto it 
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Link not working.
https://github.com/agillis/esphome-modular-lvgl-buttons/blob/a87246d216cb7c47954042c9283356eda0e8fe53/waveshare-esp32-s3-touch-lcd-2.8c_test.yaml