Yup, FP is already a B Corp (and as you can see on their assessment, FP is doing worse than the median B corporation when it comes to governance).
Generally, B Corp shouldn’t be an objective for initiatives that truly want to revolutionize our ways of producing and consumming. It is extremely easy to obtain, especially for European companies: B Lab is a US nonprofit and they are simply not as stringent with foreign companies (I personally contacted them to know how to get a B Corp certification for my France-based start-up, and I was very surprised to hear how easy it was). It may be meaningful when it comes to established multinational corporations, but for start-ups that claim to act for the bettering of society, it shouldn’t be taken too seriously.