Earlier quoted context omitted.
Of course marketing on your own behalf is helpful, but I’ve found that the most successful people don’t brag about their achievements. Instead, somehow they get other people to talk about their merits within the organization.
This easily gets to a semantic argument. Bragging is making your achievements known. Bragging poorly is doing this in a way that's too obvious & grating to the listener. If you're accused of bragging, this means you are bragging poorly.
But superiors working with you, observing you in action, will come to a conclusion too.