'Tis utter bullshit though.
The polls had remain well in front until the immigration angle was pushed, alongside the implication that all of Turkey would soon be moving here and a poster showing Syrian refugees and the words breaking point. I am not misremembering that. A poster that this piece claims was quickly taken down, as if that means it had little to no effect, yet I am sure everyone has seen it and can remember it, and for some, it made their mind up.
The piece claims it was crystal clear that leaving the single market was inevitable, and then says that not all leave campaigners agreed. So which is it, inevitable or debatable?
Seeing as you are doing exactly what the article stated, I do not think the article is "utter bullshit".
I knew that getting out of the EU meant getting out of the single market, it was mentioned enough in the Leave campaign.
As for bringing Turkey etc into the equation I think those that were voting out did so for the main reasons in the Leave campaign. You seem determined to keep spinning what you would like the reasons to be. Thus the article does describe your stance in my opinion.