SNAP Radiometric Terrain Flatterning

My question concerns the tool Radar → Radiometric → Radiometric Terrain Flattening.

At the tab “Processing Parameters”, there is an option to select a DEM Resampling Method.

Is my assumption correct that only the DEM data will be resampled and the SAR data pixels stay untouched, meaning they are not resampled?

That means that I can perform this step before speckle filtering (which ideally works best on SAR data, which did not undergo a resampling process before and therefore their specific statistical properties, for which speckle filters are designed, are still present)?

Thanks a lot and best regards…