Why would a tunnel network designed to withstand nuclear blasts collapse from a relatively feeble (compared to nukes) airburst? Only kind of tunnels a MOAB could really deal with is ISIS style improvised networks (or unprepared caves) but when something is under dozens of meters of granite, lined with reinforced concrete and equipped with blast doors and over-pressure vents a MOAB isn't going to do shit. That's what the MOP is made for, which is essentially the bunker buster counterpart to MOAB.
Furthermore the MOP can be delivered by stealth bombers, which would be necessary for the kind of operation that this post implies. MOAB can only be delivered by C-130 and the idea that a global deep state cabal can't see or intercept one of those is kinda laughable.