Reply by RobHannon

They are probably recommending something like DAP Weldwood. Comes in a powder and you mix it when you are ready to use it. Long open time and very still so it is great for bent laminations. Never seen it in a box store though.
Liquid Nails and Dynagrip are construction adhesives, generally polyurethane based. They would certainly work for gluing plywood to plywood, but I don’t know why they would be any benefit to them over regular PVA wood glue. If you are just doubling up plywood for a bench top or something I am not sure there would be a huge benefit to something like Weldwood either. What are you building?