I commented in the article:
Litecoin is a proof-of-work based currency just as Bitcoin is. That means it is also vulnerable to a 51% attack, just like bitcoin is.
However, to reach 51% of hashing capacity with Bitcoin you need tens of millions of dollars worth of GPUs and FPGAs (ASICs would work too and cost less even but every one produced is already allocated to buyers and thus delivery is not available).
For Litecoin, that number necessary is much less, a fraction of a million dollars, or much less even due to Litecoin pools not being mature and able to remain up during a DDoS attack.
The steel door of a bank vault needs to be just as thick whether it stores inside just one million dollars of funds or two billion dollars. The same scenario is at play here.
So Litecoin simply is not simply a less costly sibling that using a different hashing method, it is a completely different animal when you consider the risk profile.
