Let's start with a fact that everyone should know. The S*n is a despicable hard-right propaganda rag that nobody should read. They have no respect for the truth or basic human decency. If they decide to attack you for any reason, they will print lie after lie to smear you, even if you've just survived a horrific football stadium disaster at the hands of a negligent police force.
On evening after The S*n mocked a footballer with black ancestry by comparing him to a gorilla and attacked the city of Liverpool on the eve of the Hillsborough disaster, hacks at The S*n decided to turn their fire on the Labour MP and Shadow Justice Secretary Richard Burgon.
The S*n's political editor Tom Newton Dunn attacked Burgon for supposedly joining "a heavy metal band that delights in Nazi symbols". Everything about the story is fact-averse nonsense. [SOURCE: The S*n's attempted hatchet job on Richard Burgon is spectacularly idiotic.]
Did this MP turn to IPSO?
Nope. He tweeted. And articles such as the above are the result.
Does that undo the impact on public opinion (anti-Labour, what Chomsky would recognise as anti-left-wing [he actually wrote of anti-communism when originally writing the propaganda model at the height of the Cold War] FLAK)? No. This is part of long-term influencing of public opinion, just as the 1000s of anti-EU articles, no matter how absurd (the EU insists British bananas must be straight is a fairly typical example of the dripfeed over decades), clearly impacted on the Brexit vote.
It does suggest IPSO is poorly regarded.