I download the latest image (rk3568-eflasher-friendlycore-focal-arm64-20220706.img.gz) from Google Drive and flashed it onto the eMMC. It boots just fine but I couldn't find the header packages under /opt as mentioned on https://wiki.friendlyelec.com/wiki/index.php/NanoPi_R5S#Install_the_kernel-header_package.

Were they removed completely or just at a different location?