I'm curious: at any point did it mention, at all, that none of the technologies mentioned as being used on Savage for life extension are particularly radical in nature, or that they all have a basis in currently ongoing research

They were sort of ok about this part. Almost every technology which they mentioned (including the blood filtration) they explicitly said "based on research at the end of the 20th century" or "based on research at the beginning of the 21st century" and then had a very short (generally no more than 10-15 seconds) clip of the actual research, such as one of the actual blood filtration machines. One funny thing was how all the advanced futuristic technology was all shiny and had a blue glow to it and other standard scifi bits while you could tell at a glance what was real footage because it looked a lot more like, well, real machinery.