Earlier quoted context omitted.
It is, but the key point is that this doesn't lead to people sending mail to the wrong address since nobody can sign up to "the wrong address" in the first place. There's one address allowed, aliased to all permutations.
It does lead to people sending mail to the wrong address, from personal experience since Gmail was in beta. I've gotten sensitive emails and account signups with different dots for years. But the cause of that appears to be user error -- people thinking they own email addresses that are not actually theirs.
They never had an email address with or without dots that's made up of the same letters as your email address. Their email address is probably very different (maybe they forgot to add a number, or a middle initial, or typed Gmail when they should've typed Outlook). The dots are just a stylistic choice.