I disagree. I think a simpler explanation is that someone being arrested would continue to deny having done anything illegal. While it may be true that he "ate too many drugs", and it's not impossible that he would suddenly speak the truth, it's far from "logical" to spontaneously confess an illegal act to an arresting officer. Even if Occam suggests preferring the simplest explanation, logic would suggest preferring the self-interested explanation, even if this is a lie.

Responding to your other comment here to keep things compact, I also disagree with your statement that the author of the article believes "I ain't do no drugs" is acceptable English. What he claims, apparently as an expert, is that the grammar of this phrase fits a standard pattern in the particular dialect known as African American English (AAE). Given the relatively flawless academic English of the article, I'm almost certain the author distinguishes what is standard in AAE from what is acceptable in (unmodified) English.

That said, your personal experience of hearing the phrase "I ate too many drugs" is a very useful datapoint, and does undercut this part of the authors argument.