At the end of the day dude I am not sure it matters, the weakpoint of any of the ground anchors I have seen would be the chain. i.e. a thief would be wiser to try and cut the chain rather than the ground anchor.
The anchor just stops someone lifting the bike, chain and all!!
But for what it is worth I have one (well two) that are the same design as the groundhog1 one from your link.
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