The idea that you can simply scale up a human weightlifter is non-sensical. Humans simply do not work in a mechanically comparible way to a sauropdod.
That's right. The human would be a LOT stronger, at equal weight sizes.
And they would be totally incapable of functioning. Their bones would not be able to withstand the stress of their weigjht and the forces of their muscles.
You
cannot scale
any organism up or down by a significant amount and get a functioning version.