Taking out a loan, in itself, doesn't indicate insolvency. If it did, nobody would lend, ever. Now defaulting on a loan - that does indicate insolvency.
You are correct. But an emergency loan indicates increased risk of insolvency. Robinhood isn’t going to borrow money they don’t need, and raise their interest costs. Likely the loans were preexisting credit lines, so they were obligated to find Robinhood upon request.
The question is whether it will be enough and if not, whether new loans or investment will be available. Sitting on the outside it’s impossible to know whether this is an eminently comfortable buffer or a last finger in the dike.