The Ecover Zero Non Bio is a good product. I was able to locate this SDS Ecover-Laundry-Liquid-Zero-Non-Bio-Laundry-Liquid-COSSH-Sheet.pdf and it mostly supports what their site is listing for ingredients.
Essentially as a cleaner it's a combination of non-ionic and anionic surfactants and the combination non-ionic and anionic surfactants are what it is doing the cleaning. They are using environmentally safe and biodegradable surfactants. Once diluted in use the ethanol (denatured alcohol likely with isopropanol) does not do much; its often added to help with solubilizing other ingredients in concentrates. There is a chelating agent that all basic detergents have to allow use with hard-water. Otherwise, the citric acid and sodium hydroxide are used to adjust the pH, and the SDS shows pH = 8.6 which is near neutral and in-use will be very near neutral pH.
Based on the concentrations specified in the SDS, when using the product for manual cleaning dilute 10-mL/L.
Note: For those in the US, Ecover sells a ZERO Laundry Detergent but it is a very different product - Ecover Laundry_93oz_Zero_CA Disclosure_012220 (netdna-ssl.com) with upwards of 28 ingredients.