One interesting take-away he paid about $20K for it. I think those packs have 6-7000 cells, so that works out to about $3 per 18650 cell.
That’s not bad on a per-cell basis. New old-stock laptop packs with similar capacity cells seem to go for $3-5/cell, though I’ve scored a few for ~$2.25/cell.
Since he was able to use the packs more or less intact, though, $3/cell is a great deal, considering all the labor he saved disassembling packs and then building a large pack for his project.