Yeah, why even remove these filters? It's not like they cost a lot. Plus, the website doesn't say anything about these acoustic filters or dampeners. I recall seeing them talked about on the website in the past.The finish texture is definitely different as they confirmed: powder coated instead of anodized – I prefer the anodized finish for sure.
I'd be curious why they would stop offering the other filters if they hadn't retuned them a bit – I can't confirm the difference without burning in the new one quite a bit.
Edit: Yeah, it appears that they have removed it. This probably explains why the 2nd package revision contains only 2 filters; they are slowly phasing these dampeners out.
This is what's on the current website -
And here's a screenshot from an archived page -