As long as you are aware that it will have hardened up a bit after a decade or so and drive accordingly, they are reasonably safe.
I rest my case. He's basically admitting that the rubber compounds will have 'gone off' after a decade, and, no matter how much tread depth is showing, the tyre will no longer 'grip' as it was designed to do - because the rubber compound has perished and degraded - and yet he still thinks it perfectly sensible to keep on using them - for another decade or more.
Then again, I suppose that as long as you drive really, really slowly everywhere, and take corners at a crawl, then it'd be fine.
God help you in an emergency situation though - although he'll probably come back and say that there are no emergency situations, just poor planning ...
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