My iPad still does not do the split screen

You may find these overview Apple video guides to be helpful:

After viewing, you’ll be ready for the additional Multitasking Guide:

Use Multitasking on your iPad - Apple Support

The iPad User Guide for iPadOS is also a rich source of information. Here are links to both the downloadable and online versions of the Guide:

https://help.apple.com/epub/ipad/en/

https://support.apple.com/guide/ipad/welcome/ipados

I hope this explanation and additional information is helpful in resolving any difficulties you may be having with Multitasking features of your iPad.

These marketing videos are completely unhelpful when it’s not doing what you claim it can. Thanks for nothing.