My understanding is that SCOTbot can only identify them as palnet comments if palnet was the first tag.
It's possible that it also uses app identity so commenting from palnet instead of other interfaces would still include them. I haven't tested that extensively.
Since you're using steempeak, you can always click this little icon on a comment to 'zoom in' and see what tags it has.
At that point you'll be in the comment link, so changing peak to d in the url will let you see the blockchain info, including what app the comment was posted from.
Hey @josephsavage thanks for all your clarifying posts! They help a lot.