Some here on ATS would like to have the White House visitors' log published, but IMO not that many lobbyists have direct access to the President, though he does occasionally have meetings with groups of concerned individuals or organizations.
The only way to test your opinion is for him to release the logs. This will tell us if they are lobbyists or not. As far as loopholes, have you ever noticed that when politicians close one loophole, they always seem to open up a new one?
Do you have a clear definition of who Obama considers a lobbyist or how he defines the word lobbyist? Politicians are renowned for defining words according to their own terms.
Bill Clinton's definition of SEX comes to mind.

