https://www.jetpens.com/Retro-51-Tornado-Classic-Lacquers-Rollerball-Pen-0.7-mm-Stainless-Body/pd/8233/refills

JetPens has a pretty comprehensive list of Parker style refills that will work with the Retro 51 Tornados, including ballpoints and a variety of nib sizes from broad to fine.

https://retro51.com/collections/retailer-exclusives/products/anderson-pens-palmer-rollerball

https://www.flickr.com/photos/rohdesign/5815595176/

Mike Rohde has previously had luck with the Bic Gel 0.7mm refill chopped down to fit his Retro 51 pens. Similarly he's done the Parker Gel 0.7mm refill and the Pentel Energel 0.7mm refill chopped down to fit.

https://www.wellappointeddesk.com/2015/10/ask-the-desk-retro-51-refills/

The Schmidt P8126 capless rollerball refill is compatible with the Retro 51 Tornado standard pens.

https://www.therefillguide.com/product-category/brand/retro1951/

In addition to their own branded rollerball refills, Retro 51 pens will also take a Parker style G2 ballpoint and capless rollerball refills.

Schmidt is another brand or compatible refills that is sold in Retro 51 packaging

Retro 51: New Pens, New Collaborations And New Ownership by Nancy Olson

https://retro51.com/collections/retailer-exclusives/products/ny-historical-society-rbg-supreme-court-cases

While this may describe a few people within the group and it could be a stereotypical perception for those old enough to remember the "old" web, I'd have to push back on this perception. While many of us do come from the old web, we realize how much we've given away (including our agency) and we're attempting to create a web renaissance or even a neo-web. There is honestly very little that is very retro about this and in fact it is quite forward thinking.

I suspect that Desmond is simply using this description here to set up his story.

This sentence is so weird and retro!