I think you have a pop science writer conflating a few separate scientic realities. DNA could indeed be intact after thousands of years. And sperm could probably be viable after thousands of years IF stored at say liquid nitrogen temperatures, which is what you would do in a modern lab. But viable sperm after 27,000 years at only permafrost temperature? I'd be surprised if biological scientists are saying that is cold enough for long term preservation of biological function. So I wouldn't think they are not going to pull out and reanimate actual sperm. But maybe they can find most of the DNA sequence intact.
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