If I remember correctly from when the regulation was originally discussed, there are a lot of restrictions on the natural gas plant before it's considered green. Its only green if it replaces an existing coal plant, and if the new plant is not larger than the one it replaces, and if it has very low emissions.

Edit. Found a source:

https://www.europarl.europa.eu/RegData/etudes/BRIE/2022/698935/EPRS_BRI(2022)698935_EN.pdf

Conditions for natural gas to be classified as green.

life-cycle emissions are below 100 g CO2 e/kWh; or

until 2030 (date of approval of construction permit), and where renewables are not available at sufficient scale, direct emissions are below 270 g CO2 e/kWh or, for the activity of electricity generation, their annual direct GHG emissions must not exceed an average of 550 kg CO2 e/kW of the facility's capacity over 20 years. In this case, the activity must meet a set of cumulative conditions: e.g. it replaces a facility using solid or liquid fossil fuels; the replacement leads to a reduction in GHG emissions of at least 55 % over the lifetime of the newly installed production capacity; the newly installed production capacity does not exceed the capacity of the replaced facility by more than 15 %; the refurbishment of the facility does not increase the production capacity for co-generation of heat/cooling and power from fossil gaseous fuels; the activity takes place on the territory of a Member State which has committed to phasing out the use of energy generation from coal; the activity ensures a full switch to renewable or low-carbon gases by 2035; and a regular independent verification of compliance with the criteria is carried out.