So I’m supposed to tell you what you planted your plants in? Soil and coco are different things. Your link tells us nothing about your growing medium, it’s just info on living soil.
edit: never mind, I saw the second link. I don’t think you have nute burn, those appear to be deficiencies. The link says your soil can feed up to 8 weeks, how old are the plants? That usually means 8 weeks max so they may be running out of nutes. You could try watering only for the next few days, if it doesn’t change or gets worse, it’s deficiencies. If it gets better than it’s burn.