Yes, they are adding fees to the currently free APIs, the OP is not the currently free API, it's a paid API that has been around since 2017 and has always been expensive. There has been no announcement of what the new cost structure will be because that would require Elon Musk to plan more than a few days ahead
Quote from @TwitterDev:
"Starting February 9, we will no longer support free access to the Twitter API, both v2 and v1.1. A paid basic tier will be available instead"