This method will work for some people, but not for everyone, which is why there’s an issue in the first place.
The hue devices, both the bridge and the dimmer switch, expect all Hue bulbs to be on a ZLL channel. So they will only reset devices that are on one of those channels.
The ZLL channels are a subset of the ZHA channels. The smartthings hub is a ZHA device. It can use any of the ZHA channels so, for example, it might use channel 14, which is not a ZLL channel. Or it might use channel 15, which is a ZLL channel.
You can see which zigbee channel your own hub uses by looking in the IDE. The only way to get it to use a different zigbee channel is to completely reset your hub, and you can’t specify which channel it should use, it’s just random. You might even get the same channel again. And after doing this kind of reset you have to completely rebuild your network and add all the devices back again. 
When a zigbee bulb is connected directly to the Smartthings hub, it gets set to the zigbee channel that the hub uses – – and it stays on that channel until after it is forced to reset.
So, if you got lucky, your SmartThings hub was on zigbee channel 15 or 20 or another ZLL channel. So the hue bulb attached to the SmartThings hub is still on a ZLL channel. Those are the ones that can be factory reset by a Hue dimmer switch.
But if you were unlucky and your smartthings hub was on zigbee channel 14 or 24 or another non-ZLL channel, then that’s the channel you put your Hue bulb on, and the hue dimmer can’t reset it.
The Lutron “connected bulb remote” (available in the US), the Dresden zigbee module ( made in Germany and available for shipment to either the US or the UK) and some of the old Phillips remotes like the ones pictured in the thread above ( sometimes available on eBay in the U.K.) will try all the zigbee channels when they are forcing a bulb to reset. Not just the ZLL ones. So that’s why those devices will work on some of the bulbs that the hue dimmer switch cannot reset.
It’s not about the bulb. It’s about the zigbee channel that your hub is set to. Which is why different people get different results.