Exactly - it's a classic case of a tool being used for a different purpose ("IDE") than its original intention ("presentation software") and getting criticized

Exactly - it's a classic case of a tool being used for a different purpose ("IDE") than its original intention ("presentation software") and getting criticized for not holding up to misguided expectations. His criticism is valid but the main lesson is to use the appropriate tool for the job. He himself uses VSCode + iPython, which is a better tool more generally for the desired use case of code development.