Is it true that in the Shafi'i madhhab there is a category of najis that is forgiven?

On the website https://islamdag.ru/verouchenie/23254 (last 2 paragraphs) I saw this (the website says it in Russian): > There is a certain category of najas that is forgiven (i.e. afwu). This is impurity that can stick to clothes from dirty streets if it is impossible to protect oneself from it, if the dirt is not higher than the waist. Afwu is made from raindrops flowing from dirty roofs; from a small amount of blood from a wound and from boils; from blood from an injection site (if it does not come out too much); from the blood of a crushed flea or louse; if a small piece of dung gets into milk, afwu is also made. If a baby vomits and touches its mother's breast with its mouth, afwu is made from this; if a little impurity remains on the entrails of a slaughtered animal after washing, afwu is also made from this; one can eat bread baked on a dung fire. Afwu is made from additives for making cheese. However, it is strictly forbidden to use the duodenum or other body parts of an animal that is not slaughtered according to Shariah standards or is completely forbidden for consumption, especially a pig! Afwa is also made from hair that has migrated onto clothing while riding a donkey or a mule. In short, from all najasah (impurities), from which it is very difficult to protect oneself, the Almighty makes afwa (forgiveness). (This website tells all about the Shafi'i madhhab) So, the question is, is it true that there really is such a category of najis in the Shafi'i madhhab, and also, if this is true, it turns out that I can perform ablution, prayer, along with this najis on my body? Also, does splashing water from the toilet bowl, purulent snot, for example, apply to this najis?