This is the way I read it as well. The high court was to make sure everything had been done appropriately. This couple haven't only just found out the name of this guy, it's just reporting restrictions are now lifted. I would argue if they've got the names of the Tattlers that caused the defamatory statements, they would know them already. Plus they'd only be able to go after the people who have said specific defamatory things about them and their business. Not someone who doesn't like a certain influencer.
Also I would say they literally can't out everyone on there. Some people haven't posted in years or have migrated away from the influencer threads and just gone into the general topics.
Again if they out everyone, what happens to here, to Reddit, to football team forums, Facebook pages, spotted pages where people insult others on the daily, X, Daily Mail online, any tabloid newspaper?
What is the difference between a Daily Mail reporter writing that Katie Price looks frumpy to someone online saying that? (This is an example btw)
People who have used Tattle to harass influencers and admitted they've called social services or reported them, then I absolutely agree they should be dealt with.