I can not tell you to delete vbulletin tables that would be irresponsible of me.
I can tell you our tables would be the ones prefixed with the prefix noted in your config settings of classifieds. If it is cp_ then that is what your classifieds tables are. If your getting some vb4 error about some table that is there's not ours then that is on your
vb. You need to do whatever you need to do to resolve that. Our tables are as you see the ones with our prefix.
The thread your pointing out is about some gentlemen who gave his classifieds table the same prefix as his
vb tables which is wrong to do.