Miscellaneous Movie Musings the Sequel

[Alex]

I'm trying to figure out this line from an early review of The Expendables:

Originally Posted by Genevieve Harrison in Empire

They are, however, “getting too old for this ****”. Clive James once described Arnie as looking like “a condom filled with walnuts” — now it’s the other way round.

The only way I can figure to read that is as saying that Arnie now looks like a walnut filled with condoms, which I think would just look like a walnut. In other words, rhetorical nonsense. Is there another way of interpreting that line I'm missing?