EDA04510-V1-0_misc4 (Thermal Sheet) should not be FR4
The Thermal Sheet mechanical part EDA04510-V1-0_misc4 is described to be manufactured from 'FR4 Halogen Free, according to IPC-4101/127'. It should be made of Laird Technologies K200-NA-30X30 or equivalent.
The code 44.88.75.020.9 seems to be an insulating foil, glas fabric with epoxy.