From Article 2, Section I:
"Each State shall appoint, in such Manner as the Legislature thereof may direct, a Number of Electors, equal to the whole Number of Senators and Representatives to which the State may be entitled in the Congress."
I can try and find the specific declared rules under which this appointment currently happens (since that part isn't in the Constitution), but my understanding is that the election is to choose which set of pledged electors will be appointed. Right now, they are merely nominees chosen by their respective parties.
I'd certainly love to see it. It's possible there's a perspective that I'm missing, but from what I can see I feel like it's quite clear that you can't both appoint electors and not certify their election.
Ah, okay, now I see what the article is suggesting. Not that Trump would fight the election after the fact and prevent them from certifying, but that Trump would proactively ask them not to vote for their electors at all and simply appoint them by legislative fiat. Which would certainly be within their Constitutional rights to do (and would absolutely lead to massive fucking protests).
While it does mention the possibility of a candidate receiving less than 270 votes, I don't see any described scenario under which that would occur - short of failing to appoint electors at all, which as I noted would actually just lower the number of electoral votes required to win.