Alright sorry to be bearer of bad news but the mod_info.txt is broken on the seedbed version.
{
"description": "This version has been altered to (hopefully) be compatible with the seedbed mod.
Version 1.2 - just a few more fixes.",
"name": "More Parasites",
"minimum_version": 2.2,
}
Aside from that great work. Everything seems to be in order.