It's actually even sillier. In RI you get delegates for hitting 10% both statewide and congressionally. Cruz is currently winning 3 delegates because he didn't fall under 10% in RI-1 or statewide. Ben's Rhode Island baseline (Trump's "on-track" number there) would have required Trump to keep both Cruz and Kasich under 10% statewide and in both congressional districts. Obviously, a world where Trump manages that is very likely a world where he's on-track to win 1,237 pledged delegates.
When I was watching MSNBC last night they mentioned something about getting all the delegates automatically if you got over two-thirds of the votes; perhaps they got that wrong, I dunno. Either way its ridiculous, the "Trump has to limit the other candidates below 10% of the vote everywhere!!" thing is just more so.