After removing Sonos Connect devices, entries are still displayed in the logs. I removed them through the mobile app and they no longer are listed in the IDE.
It doesn’t seem to cause any issue other than cluttering the logs.
To be clear you are seeing past events in the logs for the Sonos and not anything new. I don’t think the correct behavior would be to expunge past events from logs when you remove a device. I mean, I could see the argument for it, but I think I can see the reasons not to do it as more important.