"Separate, yes." He stares at his full again glass and tries to drink at a more sedate pace. "Many things. Many interesting people. I hope no one else from home shows up."

That is indeed a reference to a Certain Someone, but it is an oblique one. Rodolphus didn't tell Bellatrix about his dreams and he's certainly not going to tell Antonin. Probably. Well, he'll try not to. Damn.