A quote from the summary of the book you listed:
feeding torrents of freshwater into ocean basins that rapidly filled
to present levels. The removal of the enormous weight of ice at high
latitudes caused the crust to bounce back triggering earthquakes in
Europe and North America and provoking an unprecedented volcanic
outburst in Iceland. A giant submarine landslide off the coast of
Norway sent a tsunami crashing onto the Scottish coast while around
the margins of the continents the massive load exerted on the crust by
soaring sea levels encouraged a widespread seismic and volcanic
Could not access the other links. This is clearly bordering on pseudoscience. I admit I have not read the book but the summary makes it sound like junk science. As a scientist I am skeptical and all of this seems like a stretch. I sure would like to know how crustal rebound (isotasy) affects a volcanic hot spot in the middle of the ocean. The hot spot is most likely generated at the core-mantle boundary where convective cells in the core meet the mantle and melt it. The whole scenario sounds like a bad movie. Is there anything that someone will not blame on global warming? And how would we ever know that a landslide in Norway was due to crustal rebound/global warming?
But the author is disingenuous. Even if he is correct, he implies that the changing climate in the past and any potential events associated with that changing climate might be related to changing climate today. But climate change of the recent past has been due to the earth cycles set out by Milankovich and not to man-made global warming. How can the two be compared when in the past we had a 6 degree change and now we are looking at only about a 1 degree change up until now. Sounds like he is desperate to sell his book and hypotheses.