Read between the lines. They didn't have a liquidity issue after they disallowed the buying of stocks that had the 100% capital requirement from the clearing houses; hence, they no _longer_ had a liquidity issue.
If your business can't function normally (i.e. you have to disallow the buying of stocks that should otherwise be purchasable) because you don't have enough money, that is a liquidity issue. This is costing them a huge amount of bad publicity and losing them a lot of customers, so it's clearly an issue. If that issue is because they do not have enough cash on hand for normal business functions, then it's a liquidity issue.
