I don't think it means literal 24fps. I feel it means "you should use 24/23.976 instead of 30 or 60" (This is just my guess).

But anyway, I can confirm most of their videos are 23.976 fps for live action series. Exception: I do see 24fps for some animes.

This is not a guide for framerate. Netflix accepts multiple frame rates.

This is a guide about data bitrate, what it says is that for 24fps, you need at least 240Mbps (means it needs more if it has higher frame rate).

If anything, all the other language versions actually use "23.98" as example instead. E.g. this Deutsch version: https://drive.google.com/file/d/1WLz0O_dwmVWjqHafaHoLav0qvHU...

This guide https://partnerhelp.netflixstudios.com/hc/en-us/articles/441... mentions more about frame rate but it's basically just "don't convert frame rate around, and use constant frame rate for intermediate file".