The version of the CODEC library differs between the documentation and the script on GitHub.
RZBoard-Linux-Yocto-Development-Guide-v2.3.pdf : V0.58 (RTK0EF0045Z15001ZJ-v0.58_EN.zip)
https://raw.githubusercontent.com/Avnet/meta-rzboard/rzboard_dunfell_5.10/tools/create_yocto_rz_src.sh : V1.0 (REN_VEDIO_CODEC_LIB_PKG_EVAL="RTK0EF0045Z15001ZJ-v1.0_EN)
If the documentation is out of date, it would be helpful if you could update it.
Best Regards,
Shingo