I think the Skeptical Feller was kidding.
I suspect his point wasn't so much that an oatmeal cookie was a good seed material as that Cycle and the rest of that lot were not. No better or worse than an oatmeal cookie. They're no better or worse than anything organic.
Anything that will decay will attract bacteria that will cause it to happen. This will include bacteria that will eat the nitrogen products that get spun off when the proteins break down.
Shrimp seem to have a certain following from the Salty world.
Fresh simple ammonia from a bottle works just as well and without the smell.
The bacteria are everywhere and they will inevitably find their way to your tank. Maybe just a few an hour passing by, finding good eats, reproducing. The tiny colony may double in size every 24 hours, a few thousand, a few tens of thousands, twice that, twice that, twice that, and in no time at all your talking about millions and then billions. Takes about a week or two for the ammonia eaters and another week or two for the nitrite-eaters. Happens exponentially nothing, nothing, nothing, nothing, nothing, a little bit, a little more, done.
Always works.