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You have a static IP?

You can use a client to update the record of your dynamic IP. I don't know if that's what he's doing, but it's in all the Pi web hosting tutorials.

The solution you propose is problematic as you'll have random redirection problems even if your script updates your DNS every 15 seconds.

Yes a have a static ip, but DynDns like service providers works too. I use then for years, before my DSL provider gave me one :)