I usually like Skellturix's videos, but the issue I have with the GAS one is the claim of "all g12" is unsupported. In the video, there is a g13 b1, but Skellutrix says it doesn't matter. Yet when I look at GAC opponent's rosters, the ones who have GAS and lower overall gear Separatists seem to have a g13 b1 in common.
The other thing to keep in mind is that Skellutrix seems to have a pretty great collection of mods. But even the Skellutrix video admits to a ton of RNG conditions--not only landing all Droideka assists, but also Echo not removing the damage immunity. The latter almost never happens for me. Especially if you're trying to take out Fives first during the topple.
I think while the video is to suggest it *could* be done with g12, you're going to save yourself a lot of headache by bringing one or more of those droids to relic 1-3.