that would put lifting at an Olympic level

It is not…

The world record deadlift is like 1,100, almost twice what OP is claiming.

Now, by no means am I saying OP can do it. But my highschool gym teacher could pick 300lbs off the mat to standing with one arm. And while he technically did go to the Olympics one year, it was because he bought a ticket to sit in the stands.

Its not impossible, but you’d likely know by looking at someone if they can do it