I see a chain whip in your pictures, it is not needed to remove a freewheel.
As others have pointed out, put your "tool" into a vise with the tabs facing up. Slip the wheel onto the tool and turn "the bus steering wheel" to the left. easier to do when a tire is mounted on the rim, provides extra grip.
Another method I use, especially when a vise is not available, is to use a long (25") breaker bar with a socket to fit the tool like this one
https://www.harborfreight.com/12-in-...bar-60819.html
