Re-read my post again then. There are clear differences (even just the flat out basics of his statement regarding crouch canceling are false).
Maybe you should elucidate the clear differences. All I see is maybe some imprecise language. He says,
It tremendously reduces the knockback of the move, reduces the hitlag, and the move is weakened so you must be at higher %age to tech it
This is really just redundant. It may not reduce the hitlag (is that what you mean?) but that's not really relevant. But lower knockback means you can't tech until higher percentages, so he's basically repeating himself.
You have to be crouching to crouch cancel, if you're not crouching you're not crouch cancelling.
This constitutes a definition. It is used to distinguish CCing from ASDIing into the ground. The two concepts may be conflated today, but perhaps more than five years ago, when the post was written, that wasn't the case. Instead of declaring his definition to be false, and insisting that your definition be used retroactively, adopt his for the time it takes you to read the post.
Usually you're DIing down with the control stick when you're CCing, which makes you ASDI down on the weakened move, thus makes you land right after the hitlag
While saying "DIing down" is not entirely accurate, the core meaning of what he's saying is identical to what you said: The action of holding the control stick down to CC results in downward ASDI. The ASDI's velocity, subtracted from the reduced knockback due to CCing, causes you to land immediately after hitlag ends. Like I said: it's imprecise, but it's not patently false.
CCing weakens the move and ASDI down makes you stay grounded.
100% fact right there.
You do realize SDI doesn't even add to velocity components right (and the implications of if it did)?
I suspected SDI didn't add velocity components. I realize this gets into the theory of coding this, but I like to try to think through these things before dismissing them out of hand. Perhaps only the first SDI input could add velocity?
I can understand if there isn't the will to make that work. But you can just say that, rather than the patronizing I'm getting now.