Anyone know how this freewheel comes off?

It's a cassette, so you're taking the sprockets off the freehub body.

As @benjabbi sez, you lock the back group of sprockets and then top gear unscrews off the freehub threads like a fixed.

You could remove the freehub with the sprockets on, by first removing the axle to access the hex bold holding it onto the hub shell.
 
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