Flashing the blobs to the cache-partition is only the first step of "the linux way". After that you boot into recovery-mode and copy the blobs from the cache to the oem partition (which is not writable from fastboot without the emma-update but writable in recovery mode) and erase the cache partition again. The instructions at the top of the first page skip the flashing to cache step and directly copy the blobs from the old blob-location to the oem partition.