Great to see you around! :)

Well sure, but this would just be included in the known amount of heat released from the core, which has remained constant over the past 50 years.

I totally agree. This is in fact the entire point of the post. We know the amount of heat released by the planet, up to some error bars (we approach the 5% accuracy). Then, if one constructs a dark matter model, we must make sure the dark matter contribution fits within the error bar. This is where the contraints shown on the last figure come from.

While it may be a contributor to overall planetary heat release, the warming phenomenon is still caused by an increasingly insulating atmosphere, as seen by decreasing planetary energy loss, especially with wavelengths corresponding to CO2 absorbtion.

The warming is actually totally unrelated to the mechanism depicted in the post. This contrast with the title and the first image, I know (but they are funny, aren't they?).

As said above, we just discuss to one potential subdominant component of the heat flow of the planet. I insist on the word "potential", as this is model dependent. In some dark matter model, this is relevant. However, this component can roughly to 5% at most of the total amount of generated heat. This is what particle physicists must pay attention to when building a dark matter model.

The consequences of dark matter on global warming are then exactly zero (as you said), as dark matter will only contribute to a specific parameter whose value is unchanged no matter what. This does not affect any of the usual causes and do not provide any new cause to the current state of affairs.