Not according to when I checked the mod packs Saturday when Dad forgot to shut off my Internet. And, actually, they still have Voltz, they just haven't been doing episodes because of all the crap they need to do for any videos, especially the still heavily desired Shadow of Israphel series, which is likely being worked on extensively by the background people in the free time they have, taking them away from helping with any other organizing for other series for the main duo.
And, those mods are 1.4.7, the version before 1.5. Not a whole lot of more actually do 50 mod updates in a single version, whether for patches or actual updates.
And the Yogscast used basic Voltz 1.4.7, the one build it has for that version of Minecraft, and they have the mods. MPSA was once part of the MPS mod itself, according to what the mod creator has said on some other help page I looked up trying to figure out the problem. That being said, going back far enough, which isn't that long ago at all, MPSA would be utterly pointless because that came in a later MPS version, one that specifically calls upon a separate mod known as MPSA for it's mods.