Not a big deal and there may be a bigger change in the works I am unaware of but I just wanted to point out.
In the instructions in B1 as well as video it sites:
Step 1: Use Teams Toolkit to create a new custom engine agent
Open Teams Toolkit on Visual Studio Code and select Create a New App > Custom Engine Agent > Basic AI Chatbot.
However he scaffolding this lesson follows is now down this path:
Create New Agent/App > Agent for Teams > Basic Agent for Teams > Azure OpenAI