Let us be honest with everyone.
Apart from a few cases such as music playing at the same time as an app or notifications popping up. Those kind of things. What apple has implemented foe normal apps is not multitasking and it should not be referred to in that way.
Many peoples 1st taste of what multitasking is was the commodore amiga all those years ago.
What apple have done is good. And works well enough for now for most things. Of course some things would work better if it was proper multitasking.
People shoul not really be using this term as its wrong and misleading.
If you freeze the state of an app when it shuts so upon reload it's at the same point it was. That has nothing to do with the term multitasking.