How deep should you go in Jefferson Curl?

In the course videos, the demo models have the bar go significantly past the toes.

In some of Coach's Facebook posts the Jefferson Curl only goes to top of toes. Granted these people are doing much higher loads as % bodyweight.

Which is correct?

If it's based on percent of bodyweight, what percent do you change the depth?

Wrists to the step is the minimum and in training generally will be truly the least acceptable range, as the whole point is the extend the ROM as far as possible. Likely when these guys are going for heavy reps they are doing a bit of testing and highlight reels and are not yet confident enough with the weight to commit to the bottom stretch