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@Scilly.Suffolk
So how long is the 27.2mm part of the tool?
Being a large frame, it wouldn't be unheard of for the seat tube to be more sturdy than a smaller frame, so perhaps it was originally 27.0mm.
Who knows why someone decided to ream it out, or why they only went 50mm down (at least 60/65mm would make more sense), but I've seen stranger things.
Either way, if the tube is definitely 27.2mm at the top, then I'd get the rest done: using a smaller post risks damage to both the post and the tube.