What do you plan to do about it even if you do find datasheets?

Understand the implementation is the main goal. From the low part count my initial thought its an FPD 2/3 Link clone.. A hybrid maybe, partially custom framebuffer with application, partially copying a FPD link?

The whole thing looks so minimalistic, yet the result is pretty outstanding. I had similar intents of implementing such device. The board is about the size of a streched out RPI Zero, yet it provides relative high resolution display output with reasonable high graphics

It's common that automotive MCUs come with custom markings. So that might not be a part number at all, only some program version. Any semiconductor company logo on them? Could also be a custom SoC or FPGA.