Well it’s definitely not 97 K, it’s definitely not 97 C, so it’s probably 97 F which would put it in the same general ballpark as nearly all terrestrial vertebrates.

Though it should be pretty obvious from this context that it's not 97 Celsius or Kelvin.

I have asked ChatGPT to draw me an image of a 97 degree celsius t-rex and the result was absolutely amazing

It seems that this headline is following the guidelines of the times style guide: "In general, ordinary references to temperature do not specify the scale."

The Times is a US magazine. The odds of them picking a US unit of measurement are very high.