One of them, , suggests that he is ambitious.
Sorry but I'm a semi-native Spanish speaker from Spain and I've never heard this word before.
He is denying that he is ambitious.
Cicero hath recorded, that the poem of Homer called the Iliad, written on parchment, was enclosed within a nutshell.
Thackeray used it in print in The Second Funeral of Napoleon, 1841: Here, then, in a nutshell, you have the whole matter.