Actually the rule is designed to let you correct misleading titles:

"Please use the original title, unless it is misleading or linkbait; don't editorialize." - https://news.ycombinator.com/newsguidelines.html

I've done that now (https://news.ycombinator.com/item?id=43509103).

I appreciate your scruples though! Because even though you would have been on the right side of HN's rules to correct a misleading (and/or linkbait) title, the fact that you work for Google would have opened you to the usual gotcha attacks about conflict of interest. This way we avoided all of that, and it's still a good submission and thread!