No! I'd forgotten I had a "Slap Delay" bus. I'd had it on the vocal track too. So I deleted that one and thought I was done.
That fixed it. Thanks @reginaldStjohn
How do I clear the Missing Plug-ins pop up? I deleted the TAL Dub III plugin then deleted it in this project the next time I opened it but I still get the Missing Plug-Ins pop up each time I open the project. See screenshot.