I don't think it's the effect described in the article. It probably wouldn't be noticeable. It may be that by melting more of the ice below it removes all rough

I don't think it's the effect described in the article. It probably wouldn't be noticeable. It may be that by melting more of the ice below it removes all roughness of the surface where there could be air which is working as an insulation. Additionally, depending on details, by melting more ice it could probably make exchange of heat faster between the surface down below.