From a quick reading, yes. Your tool identifies code that is never run. The featured tool identifies code that never _will be_ run if we make X change to the API.

For Piranha: a) Code related to stale flags is deleted b) Determination of staleness is based on status of the feature. c) Patch is created automatically and in a majority of the cases, compiles and passes tests.

Based on my understanding of unused codes, a) unused codes is used to delete deadcode independent of features b) determining the deadcode is based on their usage in tests c) unclear whether the code is flagged for deletion or a patch created.