When a lawmaker needs technical information about a proposal, they have to ask an industry professional. That industry professional may be paid to be there, and offers complementary research services to the lawmaker. (Or they may volunteer their time). This is lobbying, and oftentimes it's a good thing!
I briefly worked for a lobbyist for a fisheries organization - he was paid by a fishing association to answer calls and put together reports about what sort of damage various laws were going to do to fish stock or fisherman's earnings for a particular region of Alaska. But it definitely creates a conflict of interest if only one side has someone there or that side is completely up-gunned.
When a nonprofit group pays for political activities, I could see why someone might refer to it all as "lobbying". But if a lawmaker needs research or opinion from an industry professional, they are not going to call up someone from a "dark money" PAC when they can just get someone from Comcast on the line directly and all the free resources they might make available.