so i had a think and there are only 4 possible ways that all the sensors went down:
1: the cabal attacked them, but this seems odd how did they sneak into the tower... Maybe the sions (however u spell that) did some telekinetic thing ?
2: lysander had agents switch them off but then icora says "there not there" which indicates they are destroyed or vanished
3: the speaker deactivated them, but theres no motivation for this and even so they are not there
4: my tinfoil hat personal favorite theory the cabal stole vex tec, i mean think about it how else did they trap the traveler? yes they sent some kind of vex devise to pull the sensors out of reality or something.
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Vex huh? That may be a good theory. They spent a lot of time sharing a home planet with cabal on mars. After both suffering defeat by the vanguard perhaps the plan was made to get revenge. They do the light work by teleporting the sensors to another place in time then the cabal come and do the heavy lifting.