Not quite sure what the "soooo wrong" is about, when your link appears to validate the statistic quoted.
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I suppose it's natural for anyone supporting Remain to be excited about this result, but it is in the end only one by-election, and fought in a highly-pro-remain constituency at that, so may not mean much in the long run really. On the other hand it does raise, again, the problem that the referendum posed, namely that there could well be a huge clash on the way between parliamentary and direct democracy in this country. If the Lib Dems are able to unite the Remain voters in a future general election (it's a big if, to be sure), then they would almost certainly end up winning a majority in parliament. And they are pro-Remain. What happens if this does come to pass, say because the Article 50 process hasn't concluded by the time of the next election?
I suppose more likely is that this just gives Theresa May et al incentive to hurry up and deliver their promise to honour the referendum result, making the question irrelevant, but it remains a fact that the entire Brexit process is bound to exposes issues with our own democracy, and it's a serious mistake to ignore them.