See, the deleted portion that you are talking about, only CBSE and some other boards have deleted that portion for the session, however, there are no changes in the syllabus of JEE Main. So, you'll have to cover those parts as well as they may be asked in the exam and will turn our to be the most important questions as not many students will have practice over them because of the deletion by the boards. You should always cover the entire syllabus to tackle any uncertainties you might face in the examination hall.

Hope I have answered your question. All the best!