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This is not a brand new function. Cmd/Z is a form of ‘good’ undo [& also universal to all apps & indeed all platforms]
Cmd/Shift/T is a particular command [though it does change between Tab & Window depending on what was last closed.] It is positioned within the Historical past menu slightly than Edit.
To check –
Begin to kind a solution or remark into this web page. Test the Edit menu.
Shut this tab, examine the menu once more.
Undo…
In different apps it may do much more, it’s context-sensitive…
Historical past Undo…
I’ve checked this again to Safari 11 on El Capitan.
It is feasible to vary these instructions in System Prefs > Keyboard > Shortcuts however I’d advise towards it.
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