I guess you didn’t pole over to check it out. I kinda hate to say anything about it on the Internet but since you posted a picture I guess it’s okay, and we are among friends here.
that’s an inflatable skiff decoy. I have it on pretty good authority that it’s something @Smackdaddy53 has been working on. The concept is similar to how a magician does his magic- misdirection.
You deploy one opposite of where you want to fish, especially helpful in keeping the entrance to secret water just that a secret. Anyone following you or accidentally coming across you will see the skiff decoy and naturally want to investigate, completely forgetting about you and by the time they realize they’ve been decoyed you have disappeared. Just like magic.