Sounds plausible. But I wonder if he meant this year alone, or over a longer period. The financial information publicly available in the UK indicates they have a reasonable cushion of funds at the moment and income covers expenses. It also indicates a high level of spending recent years. It will be interesting to see how this develops in the next few years. Income in Britain from "literature production" (presumably sales of literature to other branches) has been declining rapidly. (Apparently this is how they count it - one branch pays another branch for literature) The United States, United Kingdom and Germany have all been mass exporters of Watchtower literature in the past. As this declines their surpluses may decline. It's all very complicated, but there is information out there that is worth investigating. There must be interested people with the skills to analyse these things.
It's worth bearing in mind that the US, UK, Germany and Brazil combined account for about a quarter of JW membership. If most other countries have a deficit that's not a great position to be in. You might even call it unsustainable.