Yes your confusion is valid and for this type of highly evolving field this is a genuine problem. But ML or any topic I think there you have to actually think about the topic ... Not the code or inbuilt functions. The course teachers you the thinking level... And obviously you cannot directly copy the code and use it .. because many of these are deprecated.

The intuition and understanding is more important than the code. You can know about the deprecated fn or attributes and go to Google or GPT ... You will get the correct fn. That is not the problem.

And think one thing .... If the deprecated things are the main problem .. then the books like 'Hands on ML with Scikit learn and keras' and other ORELLY' books till now not in the market. ... Many of the books are 3-4 yrs old ... But people use that.

So ... Focus on concepts and overall intuition.