Hanafi jurists discuss recitation mistakes under several separate categories: grammatical endings/vowels, replacing letters, adding or omitting letters, replacing words, and stopping/starting at the wrong place.
The rulings are not reduced to one sentence such as “every meaning change invalidates” or “only a severe meaning change invalidates.” Earlier and later Hanafi authorities sometimes use different levels of strictness because common pronunciation difficulty (Umum al-Balwa) is taken into account.
This revised level therefore teaches the main categories and the documented areas of agreement/disagreement.