Ok I understood the source of confusion. See the phrase "doesn't opt for presumtive" as per my understanding means, when assessee wants to show income less than 50% of turnover. Because presumptive means 50% or more.
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44ADA
...., a sum higher than the aforesaid sum claimed to have been earned by the assessee, shall be deemed to be the profits and gains of such profession ....
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In your case, you are opting for presumptive since you want to show income more than 50% of turnover.
Hence the audit does not apply.