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First they say it's been there since the creation of the planet; then they say "at least 1,5000 million years". Clearly they can't be trusted to assign credible dates.

Not difficult to clarify. Because something is expressed awkwardly in a sentence, you think that makes the entire webpage a pack of lies? Nice try.

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I expect a hole is a rather tricky thing to date.

And you have no idea how scientists do it, do you? Because it's so easy to say something is wrong without backing up your comments with a shred of proof.

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Given that dating of volcanoes is known to produce erroneous results

This PRATT has already been discussed here. Your inrepid New Zealand explorers either deliberately used a radiometric dating method (K-Ar) which they knew would give erroneous results, because it is inappropriate for rock which is only a few hundred years old; or they just plain didn't know what they were doing.

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I don't speak for SoSick, but I'm wondering if you've considered what kinds of phenomena are associated with uplift.

Seashells on top of mountains would make another good discussion, particularly if you are about about to tell us why you presumably think they're not there due to uplift. However, I'd first like to see an answer to the questions RAZD has presented here. We're getting sidetracked.