I understand what you meant. That the phrase 'diversity lightning struck' seemed to imply a situation with a diverse workplace that was also good to work in. Whereas the rest of the sentence implied that the workplace was black rather than 'diverse'.

I don't think the 'diversity lightning struck' phrase is clear. So without clarification from the author we should probably skip over it rather than analyse it deeply and concentrate on the other bits that are clear.

The general theme of the article is about her experience in a minority (of one) so silly to focus in on a comment about her working as a majority.