G_TECHNOLOGY/target_technology generic is not documented in CTU CAN FD Core Datasheet nor System Architecture Documentation
It can be chosen from C_TECH_FPGA or C_TECH_ASIC and default is target_technology := C_TECH_FPGA in can_top_level, can_top_ahb and can_top_apb so it should be correct for use in FPGAs. But datasheet should document all generics.