They destroyed their own private information that might prove them guilty of a crime during an unreasonable search and seizure, therefore they're guilty of a different crime.

No entrapment at all.

Oh, and it wasn't even the person, it was law enforcement that erased the person's phone through arguably careless handling.

/s in case it isn't obvious.

You're not alone with this assessment. And what's more interesting...

“Many times the government wants to highlight what it was trying to investigate because that ups the stakes on what the defendant was doing,” Professor Richman said. “This is a case where I think they’re trying to avoid exactly that by focusing only on the destruction, and not what the investigation was about.”