Probably not. Lightroom’s catalog normally stores previews, metadata, and edit instructions—not the original RAW files themselves. If the .NEF files were permanently deleted in Windows, Lightroom may still show cached previews in the filmstrip, but those previews are not the full RAW files.

That means Lightroom usually cannot write the original .NEF files back to disk unless the originals still exist somewhere accessible. If Smart Previews had been created, you might be able to export a reduced-resolution file, but not recover the original RAW. Since original export is unavailable and recovery software produced corrupted files, your chances are the same as with any deleted file: if file recovery can’t restore them, they are likely gone.

In short: Lightroom can show previews of missing images, but it generally cannot recover the deleted RAW originals.