and the irradiance energy in W/m² is modeled in absolute value.

If the solar irradiance was modeled as change, it would have gone down in the last few decades. It wouldn't make much sense to say that lower solar irradiance (speak less energy from the sun) leads to a higher global temperature.

Long-term global temperature variations under total solar irradiance

What we currently see is a high short term temperature increase, while the solar irradiance decreased slightly. The exact opposite effect should be the case.

and the irradiance energy in W/m² is modeled in absolute value.

If the solar irradiance was modeled as change, it would have gone down in the last few decades. It wouldn't make much sense to say that lower solar irradiance (speak less energy from the sun) leads to a higher global temperature.

Long-term global temperature variations under total solar irradiance

What we currently see is a high short term temperature increase.