I'm not sure if you (or other readers) are familiar with the quote, but the title is a pun. When Caesar crossed the Rubicon river and marched on Rome to declare himself emperor he supposedly said "The die (like dice) is cast (thrown)" -- either he would become emperor or perish trying.

In the case of t article, the Rubicon has been crossed, and also features "cast" into the silicon can't be fixed (most of the time). But you're right, they aren't actually cast.

“alea iacta est.”

How would you interpret the phrase "cast in stone"? It would be anomalous for someone to pour magma into a mold.

The ordinary view would be that "cast" refers generally to the making or composition of anything by any means. Compare a few senses from Merriam-Webster:

[v.t.] 3(a) to dispose or arrange into parts or into a suitable form or order - I shall cast what I have to say under two principal heads.

[n.] 2(a) the form in which a thing is constructed

[n.] 10(a) shape; appearance - the delicate cast of her features

https://www.merriam-webster.com/dictionary/cast

Although some of the features on the die are cast - material is heated until it becomes a fluid, then deposited into openings in the suface of the die.

Do you cast as the doubter here?