I am now working on entity decoding, which Andux summed up nicely:

Next up, we have the confusing bit: a tangled mess of roughly 8
bajillion List structs, often in pairs, with record sizes that vary
according to a convoluted schedule, which may or may not based on a
combination of:
* the hexagrams of the I Ching
* Martian lunar cycles
* the migratory patterns of Mesonychoteuthis hamiltoni
* chord progression in Welsh hip-hop