Climate Action Now, page-118

Yes, Methane is a powerful Greenhouse gas, but the outgoing infrared wavelength that is interrupted by methane is 4 microns, as I have previously explained this frequency is already fully absorbed by water vapour, there is no more left for methane to absorb no matter how much you put up there.
Methane has a short life in the atmosphere and reverts to CO2 adding to CO2 levels, but the wavelengths that CO2 absorb have also been pretty well saturated.

Water vapour makes up 95% of the greenhouse gasses, it also blocks a broad spectrum of outgoing IR frequencies not just the tiny band that CO2 can block, the huge explosion from the Hunga Tonga volcano blasted 500 million tons of water into the stratosphere leading to the recent increase in global temperatures.

The logarithmic nature of the CO2 greenhouse effect | Holoceneclimate.com

"How methane contributes to global warming"

"Methane is one of several gases which act as a sort of blanket between the Earth and the stratosphere. By trapping the energy from the sun’s rays, they retain heat and warm the atmosphere around them."

A very poor description of how greenhouse gas's function. Greenhouse gasses do not trap the sun's rays but divert outgoing IR radiation.