いや、俺が面倒くさくてカタカナで書いたんだけど、
メカニカルマガジンは、アメリカの刊行物やねん

ただし、俺には結論はついたぞ
2007年の記事は知らんが、そこの頃から、F-135のタービン入口温度が1980度C(2260度K)という話はあって
それ、数字がおかしくね?
という話は、英語圏でもされてはいてだな。

https://aviation.stackexchange.com/questions/43197/what-is-the-operating-temperature-of-a-turbofan-engine-and-how-is-it-kept-at-th

タービンとロケットの専門誌でも2025年までは1726度Cと書かれていて、
GEのガスタービンでも1710度Cなのに、おかしくね? と。まだ続くで。

Q1: Assuming that by operating temperature you mean turbine inlet temperature, this article says the Pratt & Whitney F135 engine in the F-35 (JSF) has a TIT of 3600 °F (1982 °C / 2255 K), but that most high performance aircraft engines do not exceed 3000 °F (1649 °C / 1922 K), while non aviation engines are nearer 2700 °F (1482 °C / 1755 K) or lower. Exact figures for modern engines are very unlikely to be stated in public. Mattingly, in his book "Elements of Propulsion: Gas Turbines and Rockets" has a table (6-2, P363) that gives a general guideline, depending on the age of the engine. He says:

1955-1965 2000 °R = 1540 °F (838 °C / 1111 K)
1965-1985 2500 °R = 2040 °F (1116 °C / 1389 K)
1985-2005 3200 °R = 2740 °F (1504 °C / 1778 K)
2005-2025 3600 °R = 3140 °F (1726 °C / 2000 K)

The GE J79 gas turbine which had its first run in 1954 is claimed to have a TIT of 1710 °F (932 °C / 1205 K), so these guidelines look reasonable.