What is the correct form, if any? If no form is correct, please advise.
I'll start by underlining that this article is typed on a Logitech G15 keyboard.
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I'll start by underlining that this article is being typed on a Logitech G15 keyboard.
vs
I'll start by underlining that this article was typed on a Logitech G15 keyboard.
The article will be published a few days after I write the text, and, of course, read anytime between then and the next year.