This question is posted in the Lightroom Classic community, but the Adobe help link there is for cloud Lightroom which works differently. Because cloud Lightroom stores images on cloud servers, it’s possible to hold “deleted” images (images marked as deleted) on those servers for 30 days before they’re actually permanently deleted. That’s how cloud Lightroom can have a “Deleted” album. But even in cloud Lightroom, after it’s permanently deleted, that’s it, it’s gone forever.
The directions in that link don’t apply to Lightroom Classic, where file availability doesn’t depend on the cloud at all because Lightroom Classic stores originals locally, on your computer. With Lightroom Classic, if a file itself is actually deleted from the OS file system (Delete from Disk), not just removed from that one catalog (Remove from Lightroom), including emptying the Trash (Mac) or Recycle Bin (Windows), then there is nothing Lightroom Classic can do to bring it back because the OS itself has deleted the file.
That means the deleted file has to be restored at the OS level. Your post is labeled macOS, so, if the volume storing your photos is backed up using any Mac backup software, such as Apple Time Machine, the way to get back that photo is to restore it from any backup that it’s on, such as the last backup before the file was deleted.
You could then import the restored photo back into the catalog. However, it would be starting over; it wouldn’t have the edits, metadata, history, etc. that it had before, because Lightroom Classic deleted that from the catalog at the same time Lightroom Classic asked the OS to delete the file. If it’s important to restore that metadata, that could be possible from a backup of the catalog.
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