If you look at web traffic when making Gemini web requests, you'll see that Bard is still in the URL (so are LaMDA (pre-bard) and Assistant (pre-GenAI)):

gemini.google.com/_/BardChatUi/data/assistant.lamda.BardFrontendService/StreamGenerate

That's interesting! I wonder how many parts of their other dead projects are used in current projects.