The full text appears here, I think:
https://www.pressreader.com/uk/business-and-sports/20220105/281642488515765.
It ends: "This is the year when reality should finally match all the hype, otherwise even the most staunch Brexiteers may be forced to consider whether they will ever get what they wanted." That, for me, is the tricky bit. Given that I was never sure what it was that was wanted (what Brexit was supposed to look like, in other words), I can't tell when the appropriate watershed moment is for deciding whether Brexit hit or missed its target.
In fact, I wonder why the article was written in the first place - is 2022 really the defining moment, or is this just a piece of anti-Boris rhetoric? Either way, it shows that 3-word slogans like 'Get Brexit Done' are pretty meaningless, even if popular.
Oh, and my vote goes for "an historic", not "a historic".