You say “correct” but you’re not contradicting the meme. The reading that “apartheid South African” is referring to the man rather than the mine is to me more intuitive. Even if it wasn’t it would be a possible reading, so I don’t think you should say you’re correcting the meme.
I support the desire to add context the fact you did add. My only concern is that your phrasing comes off as saying the meme is ahistorical or dramatised, when it’s probably just the phrasing.