"I grew up with three languages, as my parents did not share the same 'mother tongue' " Madani says. "And, in any case, how would this manager know what language I grew up with?
The careful omission of a statement whether English was one of those three languages leads me to believe it was not. The manager knew he didn't speak it from infancy because Madani spoke it fluently but without the style of a native speaker. Perhaps the difference in that position would be irrelevant, such as a STEM job. There are positions, however, it would matter, such as sales or public relations where that last one percent can mean everything.