Some clarifications - Recorded video sessions regarding ML course

Dear Cloud X Lab Team,

I can see some additional recorded sessions added to the existing ML curriculum. These recorded sessions are wrt to the following topics—

a) End-to-End ML Project
b) Training Models

Has the contents of the earlier recorded video-sessions been changed or altered & edited at selective places ? Or
Is it that altogether new video recordings have been incorporated/added?

I can observe that the lectures are more compact as compared to before & the video recording sessions have been reduced from approx 3 hours to approx 1.5 to 2 hours.

In End-to-End ML Project (Session 4) which I recently went through , I could see new contents viz. Ensemble method, Overfitting, Underfitting etc. have been incorporated. It makes your PPT really concise, crisp and informative. Appreciate for updating the study reference materials at regular intervals & thanks a lot!!!

Kindly let me know which scenario is correct 1st or 2nd scenario as described above. This is purely for for my knowledge only.