Apple’s round checkboxes – Where and when are they used?

We are building a cross platform app, and a decision maker on my team (who is an Apple user) wants all of our "Select to delete" checkboxes to be round, "Like Apple's Mail and Messages apps".

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I personally find this confusing, I think they look like radio buttons. He disgarees that anyone would confuse round circles for radio buttons.

Apple's HIG about checkboxes doesn't specifically state that checkboxes should be a specific shape Apple's HIG on Checkboxes

Apple's Sample Code shows square checkboxes, but that's not selecting to DELETE an item Apple's TableViewCell Sample Code

Have all iOS devices always used round checkmarks to delete items, or is this a new change?

Where and when does iOS use round checkmarks?

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