I'd be surprised if what Grant posted is breaking court protocol as it's really just a fairly general description of how the system works. Just musing as an outsider looking in, so I could easily be wrong about this.
He will have signed a settlement agreement which would have, I’m sure, included confidentiality provisions - but he’s not disclosed how much he was paid, so presumably hasn’t breached anything there. What he has done is talked about the mechanics of why he accepted a settlement offer, which is a different topic. And it would have been clear he must have settled when he discontinued his case, so explaining that decision seems fair enough to me.
I understand the views about the justice system only favouring the wealthy, but think that’s just how it’s played out in this particular example. This “make a specific type of settlement offer to put the other side at risk of costs” (it’s called a Part 36 offer, after the relevant part of the civil procedure rules that set it out) is just a tactic, that can be, and is, used by both parties in litigation.
It’s equally often used by law firms representing small individuals to drive up settlement offers from the big firms (banks/utility companies etc) that they are claiming against. Lose £2,500 and make a claim for amount and you might be offered £1000 to go away. Make a (possibly slightly spurious) claim for £30,000 and the company will likely defend it. Once they do, you can make a Part 36 offer for £3000 and they may well say yes because they don’t want the risk of you being awarded £3001 and then they have to pay your costs as well…