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He's saying on native dialogues, when it lists your Apple ID email address, it includes a full stop at the end. The address and the full stop both happen to be in double quotation marks. Many phishers would place the full stop after the quotation marks, or omit it entirely.

legit -> "bill@apple.com." not-legit -> "bill@apple.com"

But you're right, it's a terrifically difficult sentence to read.

If you look carefully at the screenshot, it shows

`"email@email.com."` <- note the trailing period inside the quotation markers.

He's saying he knows it looks weird, but you have to get that detail right to look exactly like the system dialog

If you look at the dialog, there is a '.' (period) at the end of the email address, inside the quotation ("). The author replicated this, even though it seems strange.