I didn't have this addon installed at all when I was already experiencing this dumb high CPU usage bug. This addon only got installed after I was searching for it as you have mentioned and I was looking in Photos app settings to find this addon when it popped up that it has auto installed it. So, if it was only auto installed at this point, then it's not the reason.
This damn bug nearly scorched my laptop. It's a passive cooled netbook so fan noise isn't a dead giveaway and shell host infrastructure process was hammering it through entire night because I was viewing photos in the evening. Normally it runs idle at 35°C, but was running at 65°C. Trough entire night! Its chassis was so hot I could hardly hold it since it's metal. Ridiculous.