In fact Nippy is just regurgitating tired old tropes from WUWT and trying to pass them off as something new.
A single site in Greenland is not a proxy for the temperature of the whole planet
The science is well past such a small view of the use of proxies.
WUWT posters and deniers still wave that old graph around as if it means something special.
It doesn't .
Here is the Article from Nature Volume 571, Pages 550 - 554 ( 2019 ) that explains some of the problems with coherent temp records.
No evidence for globally coherent warm and cold periods over the pre-industrial Common Era
https://boris.unibe.ch/132301/7/333323_4_merged_1557735881.pdfAnd here is a more modern take on the use of more Greenland ice core data from additional sites.
https://www.carbonbrief.org/factcheck-what-greenland-ice-cores-say-about-past-and-present-climate-changeConclusion
Greenland ice cores provide a high-quality high-resolution estimate of past changes in temperatures, allowing more precise comparisons with observed temperature records than most other climate proxies. While current temperatures are likely still below the highs in the early Holocene around 7,000 years ago, they are clearly higher than any temperatures experienced in Greenland over the past 2,000 years.Greenland is just one location and temperature variations seen in ice core records may not be characteristic of global temperatures. However, global proxy reconstructions have tended to show similar patterns, with current temperatures lower than the early Holocene maximum.
Unless greenhouse gas emissions cease in the near future, warming will continue and, by the middle of the 21st century, Greenland – and the world as a whole – will likely experience temperatures that are unprecedented at least since the last interglacial period 125,000 years ago.
