Retractable threading tool - videos

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After watching both videos, it appears that the threading tool bar holder, has a dove tail slide to prevent slop in the retraction mechanism.
I'm guessing that there's a rack and pinion gear that moves this in and out.
This youtube channel is a manufacture that is selling this tool. Probably why there's no detail.
The other oddity, he's operating the lathe without disengaging the half nut, so hard forward to reverse motor operation. I think that's a good way to damage motor contactors, but he could be using a VFD. You can't really tell as his right hand is shown on the engage disengage lever of the retraction tool, so I assume that his left hand is reversing the lathe, and moving the cross feed in for the next thread pass.
Also, I could see he disengaged the tool early on a few passes.
I like this tool that was seen here a few weeks ago as it's automatic on disengage;

He also has a mechanism that disengages the half nut.