soaking seeds

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In the British Iris Society's booklet on growing irises from seeds, it says that seeds should not be submerged when soaking, just placed in a very shallow layer of water with their tops exposed to the air. It says submersion will kill the seeds.

I've not seen advice like this anywhere else, and it doesn't seem consistent with some other methods I've read about, like suspending a mesh bag of seeds in the tank of a toilet or leaving seeds in flowing water for extended periods to leach out germination inhibitors.

I soaked seeds for the first time this year, submerged in small jars for five days with daily water changes.

Any thoughts on this? If you soak seeds, what is your procedure?

Thanks, Tom