Probably not, from the approximate sizes noted in the article it sounds like Ultima Thule is a bit bigger than Diemos, which XCKD says you could escape with a bicycle and a ramp.
And just for fun, I also worked out a best guess for the force between the two "lobes": 1.5 x 10^13 N (assuming Ultima Thule is the same density as our Moon), which is about equal to the (Earth) weight of all the ships in the world. [0]
And just for fun, I also worked out a best guess for the force between the two "lobes": 1.5 x 10^13 N (assuming Ultima Thule is the same density as our Moon), which is about equal to the (Earth) weight of all the ships in the world. [0]
[0]: https://what-if.xkcd.com/33/