LBC's objective is to "find a collision in which 2 different private keys go to the same wallet" that's it. Will this break bitcoin? No, but it will be a proof of concept that bitcoin is not as secure as most people think it is.
I think the bolded part does not accurately describe true objective of LBC
because the keys they found are exactly the same keys used by the puzzle maker
they do use the word
"collision" but they're not actually simulating a true collision
imo, they are simply brute forcing to find matching keys for addresses in the puzzle transaction
So 1: LBC started before the puzzle wallets where a thing.
And 2: The puzzle wallets have nothing to do with LBC's goals, they are just a nice bonus along the way.
Bitcrack on the other hand was made specifically to find the puzzle wallets, and so far it seems off to an excellent start. LBC is currently searching a space in which it will not find the next puzzle wallet, only an empty one that bitcrack already cleared.
The reason is bitcrack is 'only' searching for the puzzle wallets, while LBC is looking for 'any' wallet with a balance, including the puzzle wallets.