I've found some info on the objector. He has an application for a US patent "Rotary Garden Apparatus, Method and System". Funny thing is he filed the application May 8 2019, so surely he couldn't have grounds for objection based on that. Maybe there's something else to it.
Rotary Garden Apparatus, Method and System Patent History Publication number: 20190343056 Type: Application Filed: May 8, 2019 Publication Date: Nov 14, 2019 Inventor: Paul William Brown (Barrie) Application Number: 16/406,952