You need to read the posts at the link you provided more carefully.
First, it says it is a “work in progress” meaning it’s working a little bit for some people, but not for everyone and there are many issues.
Then if you follow the “work in progress” link, you will come to the following page where people are discussing it.
(And remember that all of this is in the context of getting it to work with MQTT, not getting it to work with SmartThings.)
So when we get to the discussion page, we find the following issues.
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This switch seems to work on channel 26 only.
Since you cannot change the zigbee channel that your smartthings hub operates on, It’s unlikely that you will be able to use the switch at all.
But if you can get a smartthings hub on zigbee channel 26, there are still multiple additional issues.
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there are four different models of the switch, and they have different behavior. So the exact model that you get is going to make a big difference.
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most importantly, this device is not using the same zigbee profile that smartthings uses. That is allowed under the zigbee standard: manufacturers can have a proprietary profile if they want, which is what the Livolo switch appears to use. That means it is likely to only work well with its own gateway.
A major issue, which you can tell from reading the comments, is that while the zigbee profile that smartthings and most Home automation hubs use, “Zigbee home automation (ZHA 1.2)”, expects a zigbee device to do a “re-join” after it is powered off and then powered on again, the livolo device attempts to do a “join.“ That messes everything up in terms of working with SmartThings.
So I do not think you are going to be able to get this particular switch to work with SmartThings.
Here is the community FAQ on zigbee profiles and why they matter. (The topic title is a clickable link)
We are seeing more and more inexpensive zigbee devices come on the market because of the popularity of the Amazon echo plus. Look for ones which use the Zigbee “ZHA 1.2” profile or the “zigbee 3.0” profile and which also work with the Amazon echo plus, and you will have a much better chance of getting them to work with SmartThings.