This is always a classic mess, on whether the "tube and yolk" cuirass is made of linen or leather. The reason I bring this up here is because EB is a bit inconsistent in the unit descriptions. Most linothorax armored units either don't describe the armor or refer to it as "tube and yolk" without specifying material, even for the classic hoplitai. It seems like some of this might be due avoiding some sort of conflict, but there are a few that get more specific.
I am pretty sure the Etruscan hoplites mention linen corselets in their unit description. The Cretan peltasts mention wearing "spolas" made of leather. The description for the Iranian spearmen mentions both.
I have been following this issue for a while, though only recently noticed it in EB. I'm pretty sure the only reference to "spolas" are from Xenophon, who I don't think actually specifies what they are (the attribution of both leather and armor coming from a later lexicographer, as I've read from some good old reddit posts). I also know about Aldrete's Linothorax project, investigating the linothorax and the reconstructions involving glued linen.
The conflict leads to people advocating for either leather or linen. I'm not impartial, as I've felt that linen has more (as in existing) references supporting it. I'm personally a big fan of the linothorax project. I've also noticed that a lot of leather advocates tend to be hobbyists or re-enactors of some sort, there doesn't seem to be any academic research behind leather because the evidence (as far as I'm aware) is nonexistent. I have always had the understanding that linen was the academically accepted material. That being said, I'm getting information from experimental archaeology, secondhand sources, and people arguing online. I understand that there is no way to confidently say how this armor was made, but I want to know the best guesses based on existing reference/evidence.
One more personal opinion. I feel whatever the case, EB should be a bit more consistent in the descriptions. As mentioned earlier, the Cretan peltast description has "spolas" and the Etruscan description has "linen". I'm guessing there were two different people behind them with two different positions. I feel that the EB team should take a position or leave it vague.
My questions for the EB team are:
Why were the decisions made in the unit descriptions (for both the descriptions involving leather, linen, or mentioning neither)?
Is there a plan to change them?
What is the historical evidence behind both leather and linen armor in this time period? This can branch out beyond the "tube and yoke" corselet.
A more specific question, but how does the EB team feel about glued linen? I know it is speculative and would probably need water proofing.
How does the EB team feel on the issue?
I know that there are a number of people that have strong feelings on this. Just in case, I want to remind people to keep it civil.