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That's definitely a pressurised basket, delonghi do a few different types depending on the model of the machine. As @Scrabble said you need an unpressurised basket for proper espresso grind, if you just type in non pressurised basket for Delonghi EC330S you'll probably find a post from someone else who had the same issue and where to find the basket.
Gewürzt
It has multiple holes and then flows through another bit. The holes appear to be a lot smaller than the non pressurised example several posts up.