I would say, echoing the same comments, that the code of conduct by the office of the lobbying commissioner is separate and distinct. A lobbyist's reputation and their ability to operate is through trusted transparency that is highly contingent on their reputation of maintaining that level of transparency and trust.
I can't speak for parliamentarians, but I would say that ensuring ethical behaviour is of the utmost importance for a lobbyist to be able to maintain their professional standards and do their job. It avoids that sense of obligation and avoids leveraging any of those close relationships. Instead, it's there for the purpose of sharing information that is so critical to better the public policy environment.