Well to be fair, I went through I think all of those (I may have missed one or two) and none were by the author of this article. Further, I'm not a big fan of the "well, they got that thing wrong, so that naturally means they will always be wrong" reasoning, which is pretty much a fallacy on its own. It was widely believed that Trump would lose, except maybe among many partisan Republicans and Trump supporters who would naturally believe he would win. October had so many surprises that it's hard for me to fault people like WaPo.I see what you're saying but the Washington Post was consistently and hilariously wrong about Trump all throughout the election - starting from before his announcement. They weren't just wrong on 1 or 2 things but 100 or 200 things. The links I showed were just randomly grabbed from my "Favorites" list. Dana Milbank is the worst too. That guy had to literally eat paper because he was so consistently wrong about Trump (in his defense though he did go through with that promise!).
Now the Washington Post is doubling down and saying "There's no such thing as a Trump Democrat." It's like being wrong the first 200 times wasn't good enough for them, so they're going to continue being a treasure trove of stupid during the 2020 election.
People didn't want to believe someone as ridiculous as Trump could win, and all the constant drama surrounding Trump I think legitimately did put him far down in the polls, it's just that he always rebounded and was helped by Clinton having non-stop drama with her own issues. The election ended on a low note for her, which was convenient for Trump, who experienced an amazing number of scandalous revelations in October.
A lot of people - especially the WaPo - would ignore or excuse anything that would point to a Trump victory. Now they're ignoring Trump Democrats which could backfire in 2018 and/or 2020.
HOWEVER, I do think the battle for 2020 will be fought out over the 2016 third party voters. 2020 will be unlikely to get the third party turnout 2016 did (I am expecting only 2% of votes to go third party compared to 6% in 2016). So I think the Democrats can semi-"ignore" the Trump Democrats and try to get Romney-Republicans who went third party.