It is for Samsung devices only that I know of, there may be some kind of other device that works on LG devices, but it only works on devices that actually have a download mode that can be booted into normally without the jig, the jig only works on a device that is soft-bricked and can't boot into download mode via button combination like it normally would.
If the LG V20 is one of the LG devices that did not come with download mode/fastboot mode by default, this kind of trick will not work on it.
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It has download mode and bootloader, which is unlocked. I've never used DL mode so I'm not actually sure what I need it for; still researching that. My problem is that I can't flash anything, no TWRP, no ROMs, nothing. And the phone says it has different software that isn't verifiable so it will not let me do anything to get rid of it.
Anywho, I know this isn't the place for this discussion but I was curious about the jig. I'll go back to waiting on somebody to respond on the V20 board.