Which is quite simply not the case.
100g has 29.6g of protein according to the label.
One scoop total, however, is about 38g powder and 150ish calories. From the huel.com website:
in Huel we’ve set them at the ratio of 37:30:30:3 respectively; i.e. 37% of the energy comes from carbohydrates, 30% from fats, 30% from proteins and 3% from fibre.
One level scoop of Huel is 38g = 153 calories (Vanilla); 155 calories (Unflavoured & Unsweetened). A small snack size (a packet of Walkers regular-size crisps is 130 calories).