From what I remember of that vid, Lee Anderton first said the he was "led to believe" that the MSB25 wasn't based on MV50 AC, then later said he believed it was. That video is 24:17 minutes long, so I haven't re-watched it to reply here. I'm just going from memory. The Mini Super Beetle sure sounds AC-ish; it has that classic crunch and chime. But there is I believe a more reliable source for saying the MSB25 is a MV50 AC with added features. In a video for evanstadmusikk, Corey Witt, the Product Marketing Manager from Korg representing Vox at Summer NAMM, said "It's built off of our MV50 platform, the AC version..." I guess it's possible that Corey misspoke, after a long day of doing video reviews. But I'm inclined to believe that he had his wits about him and knew what he was talking about there. The quote is at about 33 seconds in.