Zacs, doubtful but not an impossibility since chocolate has been around since about 1100 BC in some form or another.
Leo Da V was a clever old soul and invented lots of thing in his lifetime that didn't materialise in the real world until recent times. Quite likely the dirty old sod came across some just for this very purpose.
It took him 16 years to paint it (apparently). Obvioulsy not working on day rates, so he must have got something out if it!