I'm not sure what the source of that document is but assuming it's reliable, washing your dirty laundry in public isn't a great response to a complaint about washing your dirty laundry in public.
Reform's collapsing, it never had a solid foundation. Fringe movements become mainstream by learning from their mistakes. Look at the Scottish nationalists, it took years to get to a position of dominance in Scottish politics - years of lobbying and failing to even get a Scottish parliament, let alone then moving into a position of dominance within it.
As with any fringe political movement it's a case of trial and error. New parties rarely appear from nothing and take power in a few years, it takes decades and usually takes a lot of collapses and rebuilds to get something that is palatable enough for the middleground voter as well as the hardcore faithful.
As the SNP example shows, a movement needs to groom the electorate over a number of years to take power. The grooming needs to start when children are very young, well before they are old enough to vote. (The EU is another successful example, I was groomed by them in the 1980s and didn't even realise it for years.)
For the hard right to take power in a couple of decades, they need to start grooming young people now. There's evidence of that happening of course with the number of children who got involved in the rioting and torching of hotels that housed immigrants last year, but that's not a sustainable tactic because any right-thinking person will be turned off by this kind of violence. Those tactics don't work in the present environment - they worked in the past and may work again in the future, but they definitely don't work today.
If the far right want to take power what is really needed is to take the left's example and get right-wing grooming into schools, into the curriculum. Shape young minds before they have the capability to think for themselves, that way when they are old enough to vote the choice won't be left versus right, it will be moderate-to-hard right versus far right, much like the present American system.
Above all, egos need to be thrown aside. Whoever represents the movement today needs to accept they are only an interim politician who will not be around when political success arrives, if it ever does.
It's a long term project. That's something that goes against the grain in modern politics, everything is about the immediate term. That, though, is precisely why the longterm grooming tactic works. While mainstream parties are fighting over the day to day, one with a longer term plan can build their support, hidden in plain sight.