He did! He also weakened the language for what defines the areas in which one is allowed to lobby. Specifically, Trump's lobbying ban only prevents officials from lobbying their former agency - it doesn't prevent them from becoming registered lobbyists. For example, an SEC official couldn't lobby for changes to the SEC, but they could lobby the other 4 financial regulatory agencies. There's also an ongoing legal debate about whether the language used in Trump's lobbying ban includes a loophole that would allow officials to continue to try to engage in certain kinds of lobbying - involving "agency proceedings" rather than legislation.
The previous administration had stronger language (no lobbying whatsoever) and a 1 year ban. So Trump extended the timespan, and poked the ban full of loopholes.
http://www.politifact.com/truth-o-meter/promises/trumpometer...
http://www.politico.com/story/2017/01/trump-lobbying-ban-wea...