I should preface this by saying I know bugger all about PPI and have not read the link, for all I know it could be about getting refunds on insurance the bank made you take out years ago, however...
In my ~5 years here, I have seen posts like these hundreds of times about hundreds of methods. Most recently, the forum lit up with "FB group posting is dead" threads, with dozens of people screaming "I suggest you all try a different method and move on.."
One thing I have learned is, people find a way.
A method is rarely "dead", they constantly need readjusting and updating though.
I suggest those of you who are in the group of people who do this, who believe a method is dead as soon as one thing changes, need a change of mindset.