It's theoretically possible in the same way that a flight system based on ignited farts is possible.
Line of reasoning:
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Medieval plate armor weighed 60lbs, and didn't cover everything. A full armor of plate covering everything would weigh more, let's say 75lbs.
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Medieval plate armor was about 2mm thick steel on average, AR500 plates are 10-15mm thick on average, lets say 12.5mm. That's 6.25 times thicker.
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75lb times 6.25 is 468lb
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Average leaf soldier carries 80lb in equipment and weapons, US soldiers ruck over double, lets say our guy will ruck around 200lb in weapons and supplies, since he's going to be using bigger weapons.
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Average for soldiers in body weight is 200lb
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Lets say the exoskeleton, engine and fuel is another 200lb
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Congrats you have over 1000lb thing that's supposedly bipedal, which comes out to 25psi, which is horse tier of ground pressure
If you knew what kind of mobility problems horses had in muddy ground, let alone their ability to use swamps or climb mountains, you'd realize why armored combat suits are plain dumb.
This.