Correction noted - thanks! The same observation "0.1 degree warming in 50 years" is made here https://sciencesources.eurekalert.org/pub_releases/2018-01/u... as well and is evidently authorial - Severinghaus?

"Our precision is about 0.2 ºC (0.4 ºF) now, and the warming of the past 50 years is only about 0.1 ºC," he said, adding that advanced equipment can provide more precise measurements, allowing scientists to use this technique to track the current warming trend in the world's oceans. "