Wiring shelly RGBW2

Hi there

Based on the video from TheHookUp (https://www.youtube.com/watch?v=B8DQntdtD4E) and his YAML file (https://github.com/thehookup/Shelly-RGBW2) I’ve installed a LED strip for in my kitchen. However I’m not a technician and I’m wondering about the folowwing

If you take a look at my photo you see how I’ve connected the power supply that transformes 220V into 24V. Just bought the item he’s referring to on Aliexpress (no shipping costs ;))

The thing is. On the power supply there’s a Line and a Neutral connection that’s connected to a plug in the wall outlet. How is this possible? Because - if I’m not wrong - the neutral and line can be moved around right? isn’t that a problem?