Hi there,
Wow, Sounds like your DEV environment is a little out of kilter.
Nothing fancy or tricky about it.
The TFT_eSPI.h is an Arduino Library, so I used that.
Arduino IDE ver 2.3.3 (I’m sure it will import into PLIO)
Step 1: Downloaded the ZIP from the Github LINK citric posted(it’s an updated TFT_eSPI. Library, etc.)
No need to make it more complicated than it needs to be. Simple steps.
Open the Arduino IDE , Pick a file or open the Demo anything for the Round Eye Display.
Check the Boards tab for the esp BSP 3.0.5 (the most recent)
From the Sketch menu pick Include Library, then Add Zip Library, Pick the one you downloaded from the GIThub link in step ONE.
NO edits, No run around the chair three times waving a chicken in hopes it will compile.
It just works. 
HTH
GL 
PJ 
Some Notes. Compared to the 2.5.23 or any older ones this is straight forward the edits are already made. Nice to use the current ver. spiffs and FS as well. They will no doubt update the WiKi for the round display but may take some time. It’s Cool the same code works on both C3 and C6 now. with current BSP’s