"their dwarf line has lost a few units "
I think some of the line may have been acquired here:
https://www.seb-games.com/store/product-category/battle-havoc/kingdoms-of-dwarves/
Certainly the musketeers and hammerers appear to be there.
Thank you for the most useful link. But this only solve half the mystery.
BTD used to sell 2 different lines of "Ironclad dwarfs"
One is the same as the ones in your link.
The other was sold as a regiment of 20 (I think) figures that while having an entry, never had a picture on their website. I've messaged BTD about it a few times, never getting am answer.
I messaged the guy who managed the stunties wiki years ago and all I got was him wanting to make an offer to buy mine since he never saw them before.
I also remember finding a regiment of them for sale on some polish auction site.
But never found much more about them

I have attached an old picture that shows the ones I'm talking about. It's the ones that are clad in metal starting from the second rank.