That looks like an 80 liter dewar. They have an inner and outer chamber separated with insulation and a vacuum. They also have tubing running in that area between for pressure control. These containers are for the transport and storage of cryogenic gasses (like liquid Nitrogen). If you cut it you'll ruin it. You should also know they sell for 2-4K.
Been filling these for 20 years. lol.
What you're describing kind of sounds like his description of it's inner parts but he was suggesting cutting it and using its core along with a smaller, more manageable part of the chamber.
I admit that I don't fully understand what he meant yet, that's why I'm not going to do anything to it until I'm thoroughly familiar with it.