“Product Backlog item selected for the Sprint” is difficult to write and read. And the Product Backlog item selected for the Sprint is no longer in the Product Backlog.
It may be helpful to define the Sprint Backlog Item, which doesn’t include a plan for delivering it (for example tasks).
The only change in the Scrum Guide would be adding something like this:
“The Sprint Backlog is composed of the Sprint Goal (why), the set of Product Backlog items selected for the Sprint (what; aka Sprint Backlog Items), as well as an actionable plan for delivering the Increment (how).”