Yeah I noticed this too, $18.66 direct from Sofirn:

https://www.sofirnlight.com/products/sofirn-sc21pro-anduril-1-ui-mini-flashlight-with-lh351d-led-lv69

Do you know if it uses a t1616 and has reflash contacts, like the SP10 Pro?

Unfortunately it is rather large for a 16340 light imho. In fact given the size I think they could have made it accept an 18350, and then offered an 18650 battery tube as an accessory.