The described behavior with CPU thermal throtteling was confirmed by
Lenovo. The limits are higher as in Windows "DPTF" works by driver
support and enables the "desk mode". In Linux the "desk mode" is never
reached due to the lack of sensor information and the system operates in
the "lap mode" which has much lower trip temp.

See forum threat there:

The patches are not published yet for all platforms. But as T480s, many
other models e.g. X1C6 are affected too.

Background info by Lenovo:

Technical description by German  magazine in German language only:

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  Significantly lower power and thermal limits on ThinkPad T480s (and
  probably others) than on Windows

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