They mention it in the article:

> Microsoft began to build on their work in 2017. Although Kazansky’s approach maximizes durability and the density of data, in the latest work, Microsoft has gone for practicality. They explore a method that enables data to be written faster and decoded more reliably than did Project Silica’s previous iterations, says Black, and it uses cheaper borosilicate glass, rather than harder-to-make fused silica.

Following your link, I found a prototype of the media storage system (2023) with just 2828 views: https://www.youtube.com/watch?v=xnK-uB4OsgU