You don't know Hansshow have 2 version ? That's funny. Hansshow have DIY version, that's the version you saw on video they tape together, but not need to cut any wire. Just for pass the tube more easier , customer could do DIY simple. Another version is plug and play version. Just connect the plug directly. Hansshow always emphise the safety for the car. None of any kits need to cut any wire.
The other kit you mentioned was also noted in the video posted above. However that kit is only available to professional installers. It is not offered to consumers as DIY.