wait a minute do you want to tell us that you believed their claims?!!
this is not the first time a big centralized service exaggerates their "security" when they are trying to attract more customers in a competitive market. and each time they end up being hacked and we realize that their security was not only not-strong but also it was among one of the most primitive and weakest setups.
everyone who has been around for a while knows that you should never trust centralization, whether it is in the form of a centralized exchange or a centralized payment processor or even a centralized altcoin. it will always end badly.