Exactly. What Farage is alleged to have done does not appear to have broken any law. Only if someone could successfully argue that providing a poll to private individuals constitutes "publishing" would he deemed to have been guilty of wrongdoing. Personally this seems unlikely as the rules around publishing exit polls are there to prevent a poll impacting voters on the day of an election - not to stop someone profiting from knowing the result of the poll.From the same article:
The Bloomberg report has raised difficult questions for the polling industry, which has been depicted as benefiting extensively from the sale of private polling data to hedge funds seeking to profit from insights into how markets might move.
Sources told Bloomberg that they believed Brexit to have generated “one of the most profitable single days in the history of their industry.” Odey Asset Management, run by the Conservative party donor and leave supporter Crispin Odey, is reported to have made $300m from Brexit.
It is illegal under British electoral law to “publish” exit polls before 10pm on the day of an election or referendum. Hedge funds and pollsters appear to have interpreted the law so as to permit the private provision of exit poll data to select individuals. A prominent barrister told Bloomberg that the legal definition of “publish” had never been tested.
Even if the pollsters were deemed to have "published" then they are the ones guilty of breaking the rules - not Farage. Farage would still not be guilty of insider trading.