Let's see, ignoring the cost of the heating equipment and the ASME pressure vessel, it would take roughly 106 BTUs of heat to heat up a ton of pig shit to 400F and an equal amount to heat up the pressure vessel. It would probably take another million or four to get it up to 600F and hold it there for long enough for the reaction to take place.
So just to heat up 2000# of the mess would cost from $50 to $125 in fuel costs alone. Fuel cost calculator
How much oil did you say a ton of pig shit would make?
(The above analysis ignores the labor costs of the thousands of pig shit shovelers.)
The turkey plant in Carthage produces 500 barrels a day from 200 tons of turkey waste. So that is 2 1/2 barrels per ton. The estimated cost is $15 a barrel, but that isn't the end all be all of the financial side. They also produce tons of high nitrate fertilizer, tons of methane (used by the plant for heating, so cost to purchase fuel for heating would be partially offset) and they reduce the landfill destined waste by a large percent (80% or more) saving transport and storage fees for the turkey plant.
This is true for the FIRST batch. The second batch will require far less; for the super-heated water is used to pre-heat the next batch.
I cannot speak as to the efficiency of hog waste .... but quoting from the article on TDP it is 85% efficient for complex mixtures of turkey offal. That is to say, for 100 BTU of fuel produced, 15 BTU of energy is required to run the process. Link may be found here.
The $10,000,000 question in any of these processes is the extent to which the heat that's put in (a) is being used by the chemical process, and thus cannot be recovered, and (b) cannot be recovered for other reasons; vs. (c) can be recovered. In cases where (a) and (b) are large relative to (c), efficiencies are apt to be very bad. In cases where (c) is much larger, efficiencies may be quite reasonable.
The biggest difficulty I see with this type of system is making it operate reliably and efficiently on a highly-variable "input". I would guess indoor-raised animal waste is probably pretty consistent, but waste from animals that feed outdoors would vary with weather and seasons. Municipal sewage would be even worse, aggravated by the fact that sewers take in more than water and fecal matter.
BTW, I find it interesting that the water extracted by the cited process is described as "sterile". That may be true, but I would have some questions about its purity.