Yes in much the same way you can literally build a rocket and go to the moon.
You may be skipping a few of the involved steps.
You may be skipping a few of the involved steps.
You email the RNA strand (a text file) to a lab along with some money. The lab converts that information into a physical object (read: virus) and sends it back to you in the mail.
What step is missing?
Distance from mailbox to live virus is a few days of bench work from a semi-competent biochemist.
And yes, this service claims to have safeguards. Does every service? Does every future analogous service? Are those safeguards guaranteed to be robust against totally novel pathogens?
Answers: No, no, and no.
Still, even though your estimates are silly, they aren't silly enough to change the conclusion that this isn't a comforting security barrier, so I suppose we agree on that much.