Yes and no. I read the instructions carefully, except that

Could have read "if there's an MMC in your device (it can be empty it doesn't matter), be sure that ..."

You know, to make it clear that as long as you have an MMC in your device, then that piece of the .item file should look as show.

I understood it as something the sdcard having to do with the installation or that there should be something on it...

I know it might be clear to you, but not all of us have English as our fist language or are that fluent in it