Yeah, K/°C difference is small, but I didn't expect Kelvin as it isn't a "degree". And I don't know that site/portal/.. If it were US newspaper, I would expect it to be in degrees F without mentioning it. It happens.

Also, any scientific paper should use units. But to be fair, even though the difference between Farenheit and Celsius is huge at this scale, I can't really imagine it or compare it.