They wouldn't necessarily be targeting the whole protest, the IMSI catcher would work broadly and from that the warrant would require them to narrow down to one and ignore rest. Unless I misunderstood the technical details the parent comment posted.
This broad dragnet nature of Stingray collection has always been why it's been a major privacy issue. Like doing a wiretap by tapping the whole neighbourhood and filtering phone calls for a certain address.
Appoint, yet still needing Senate approval is probably what made this palatable to the founding fathers. I'm guessing the old white dudes in wigs never thought that the Senate would abdicate its role by become subservient to one old dude if not in a powdered wig at least in powdered face
But the Senate Judiciary Ctte and then the full Senate get to vote.
Remember Kavanaugh's confirmation vote in 2018 was 50-48, Lisa Murkowski (R-AK) voted against, Susan Collins for, Joe Manchin (D-WV) also for [0]. Susan Collins' reluctant-voice-of-moderation act has run out of steam, finally, probably decades overdue
