It's a good combo. It does mean putting a minimum 37 points into a drone, but it is doable.
Here is something to keep in mind. The Backup Sequencer states it may be used "at any time". According to the
FAQ and the tournament rules "at any time" means "any time between PHASES". Which is a huge difference and a lot of players and
TOs forget or just don't know.
In this case he uses Projected Stasis Field in the activation phase and by the rules he can use Backup Sequencer in between the end of the activation phase and the start of the combat phase. So his shields MUST remain down through the activation phase.
The way you break this combo is simply by using any number of cards that disable or discard an enemy tech. Sabotage that came with the Gr'Oth is great for this. If you disable or discard his Backup Sequencer befor he can use them he is sitting out there with no shields at the mercy of your higher skill captains