The idea that this planet is not at all like Mars is false To say it is like Earth is even more false The Earth is not tidally locked and the heat recieved by this planet as stated in the primary source is inargualby closer to Mars than it is to the Earth Adding the GHG effect of the Earth to the Equlibrium temperature of the Earth yeilds C according to the paper But in the case of this planet adding the GHG effect of Earth to Gliese  g at an equlibrium temperature of  K  C that would then yield a temperature of  K C and so it is ridiculous to suggest that the comparison is not relevant Depending on the size of the actual atmosphere the planet could be even colder than Mars