Or he could go with the much friendlier and less elitist: "feature you might not be aware of", "feature you might not be using yet".

Im mostly disturbed by the "most powerful" part because this is subjective to project and how you work. It's not a very common case for me to commit parts of changes in a file because in most of my cases all changes I do to a file belong to the same commit since I work with feature branches. However when I do need this it's indeed powerful but judging by the enthusiasm of the post and title it just smells like the endorphin release of new feature discovering.

It is fairly an honest title. The guy talk only about that feature, use original content, talk about something available for free which he most likely does not have an immediate interest.

There is a little bit of exaggeration in the title to attract people. That's how you drive traffic to your site. And let's be honest, if the guy was driving traffic that way to the startup he founded, people would have much recommendation about much less honest strategies.