Even if he traded 10 one lakh trades and all in a month will not raise any flags in my opinion because IT department will be mostly looking for biggers transfer let's say 5 lakh per TX might raise some flag.
As you said I won't suggest the tax evading but it can be avoided with right strategies like transferring the funds to different user's account like family and relatives that we can trust.
Why take the risk? If he gets caught then he will be in a bigger problem than he will be by paying tax. I agree if done correctly he can avoid tax but still it is a big risk in my opinion.