True in the sense that it takes a vibrating membrane to produce sound. Put the membrane in a box and add a crossover and we have a speaker. This has been known forever. But there has certainly been advances in material science that reduces the distortion causes by breakup/resonances of that membrane (e.g. graphene). For box speakers we have learned how to make more rigid boxes that don't resonate (e.g Wilson's X or V material or YG/Magico Aluminum). There has also been innovation in the different ways to break-up or absorb the standing waves inside the box (e.g. B&W matrix or the tubes from the Nautilus). We have also leaned how to make better capacitors and also how to get crossover to be less intrusive. A lot of what has helped with speaker design is the computational power and packages that enable a lot of sophistication in modeling (e.g. COSMOL).There has been very little new technology introduced into stereo speakers since the 1950's. Wilson's big innovation in their new speakers is an alnico magnet, used in audio since the 1950's.
Even with all of the advances in boxes, drivers and crossovers, speakers still produce more distortion than all of the electronics in a system combined. Of course the number 1 source of distortion is the "box" that we place the speakers in otherwise known as the room.