I think the confusion is coming from not considering what a stunlock is. (Which I'm sure you know), but consider this statement, and then consider the explanations.
A stunlock is defined as: 2 or more attacks in which you are unable to escape via normal means. ie rolling, back stepping, side stepping, etc.
So in order to be considered to be in a stunlock, you must be in this situation which means you MUST be hit/staggered to be in the initial stage of a stunlock.
1 hit from a Great Weapon (or any weapon) without the necessary poise requirements to nullify the stagger is NOT considered a stunlock. You are merely staggered and in danger of becoming stunlocked.
When you toggle, you cancel your stagger animation which allows you to either roll away, parry, or block if you chose. This is why the statements of "after you get hit, or as you get hit" have been made, because without getting hit in the first place, you are not in danger of being stunlocked.
A stunlock is defined as: 2 or more attacks in which you are unable to escape via normal means. ie rolling, back stepping, side stepping, etc.
So in order to be considered to be in a stunlock, you must be in this situation which means you MUST be hit/staggered to be in the initial stage of a stunlock.
1 hit from a Great Weapon (or any weapon) without the necessary poise requirements to nullify the stagger is NOT considered a stunlock. You are merely staggered and in danger of becoming stunlocked.
When you toggle, you cancel your stagger animation which allows you to either roll away, parry, or block if you chose. This is why the statements of "after you get hit, or as you get hit" have been made, because without getting hit in the first place, you are not in danger of being stunlocked.