Games in ADF format cannot be run on an Amiga. ADF files are backup images of floppy disks, they cannot be run, they can only be restored to floppy disks.
Amiga software which was designed to be run from harddrive can surely be run from this CF card, too.
But please note that these offers on Ebay usually are rip-offs. They sell standard PC components more expensive than electronics shops. And the software is stolen: parts of the operating system without license and freeware sold without permisson of the author(s).
You can get a legal package with similar components there:
http://amigakit.leamancomputing.com/catalog/product_info.php?products_id=440
