Is 1200 years long enough it would be sterile? Like, no original bacteria or parasites?

This is my bread and butter. Peat is anoxic. It’s great for preservation and you get tonnes of stuff that doesn’t preserve elsewhere. Google “Must Farm, UK” I’m an archaeologist that does environmental work in these kinds of environments. Peat preserves eyelashes on bog bodies, it’s nuts. Dissolves other stuff though due to the acids. I’ve got a diagram somewhere give me a bit.