C-bag it all boils down to geometry physics and the law of gravity.
on one hand you have the weight of the machine as a counter balance when lifting then you have to consider knowing how to maintain as near to neutral loading either positive or negative on the hands as the object is raised transported and set in place. on lighter objects it would probably almost be better to simply grunt and lift it rather than have to push or pull an additional mass around on heavier bulky items such as sitting a Refrigerator on a table once you get over center with your hands near chest high you will find yourself in trouble very quickly in their operating instructions they go into great detail of how to handle heavier loads the #1 recommendation was to have 1 or 2 other persons at hand to help. or get a forklift to unload the thing. WHAT?? if I need a forklift I don't need that thing.
As far as trying to convert an engine hoist to be used in that fashion if you have ever short legged one and tried to pick up something you probably found out real quick how easy it was to get in trouble.
You might also notice in the GIF how effortlessly the guy seemed to be moving things around that machine weighs around 170 LBS most of the items he was moving around were about that weight or more. if the wheels are not powered as well that is a lot of mass to try and push around on small wheels, but given that it cost around $4300.00 I suspect they are powered, they would be if it were mine.