> Per their own sentence, the poor and rich are audited at the same rate yet they go on to label this "disproportionate". That makes no sense.

They point out that while the rates may be similar, the impact is disproportionate. The rich have the means to hire a tax attorney, probably have a CPA who kept detailed records, etc. EITC recipients don't even know where to start in responding, and as the article indicates, many don't as a result.