The Fylingdales Stone 1
Image by fitzcoraldo

And the fact that the artefact is thought to be in a fragile condition, that may easily deteriorate due to being re-buried doesn't matter?

No I think it does matter, I can't comment on what state the object is "said" to be in.

If burying it can be shown to give the object a shorter life than some other means of conservation tell me about it - give me the facts - what will cause the erosion, how long will it last?