I suspect more than lobbying is going on. There's certainly more evidence for that than there was for Russian interference - and look what that investigation has brought up.
AIPAC, who have a well documented history of interference, and have controversially managed to avoid registering themselves under the Foreign Agents Registration Act.
They have a well documented history of lobbying, which is what they exist to do. I don't know of any evidence that they interfere in our elections like this Russian government-sponsored org did. Do you have any?
Whether AIPAC should be allowed to lobby without registering as a foreign agent is a different subject; one worth discussing, but not what I asked about. Lobbying is not the same thing as the covert behavior undertaken here.
It will never happen though.