That is a tough question!
I discovered this page that I think will be informative to all:
http://www.araucana.org.uk/breed_standards.html
It seems the UK (which includes Australia) has both rumpless and tailed Araucana and they are NOT the same as the USA APA Araucana.
Also this:
http://www.ameraucana.org/history.html
and this:
http://www.araucana.net/thegreathorsecigaryahoo-com-2/
so no sense talking about Araucanas without specifying the country AND the "variation" if a UK standard bird.
The UK which recognizes 2 distinctly different birds as "Araucana". Frankly, given the large amount of difference between them, I don't know why they DIDN'T come up with 2 names. As you can see in the second reference, there were originally many birds in the USA with various attributes all called Araucana, the APA chose ONE standard for the rumpless, tufted breed and it was up to the breeders to "make" those birds since the standard didn't match ANY of the various birds put forward. Those that had been breeding tailed and muffed birds eventually created the "Ameraucana".
The lethal gene is linked to the tufts. Your bird appears to have tufts (which might explain the other chicks not making it to hatch) so IN AUSTRALIA it should not have a tail because the standards for UK TAILED Araucana says muffs and "face muffing" (which in the description seems to be the same as beards in the Ameraucana and EE), crests, nothing about tufts. The standard for TAILESS says tufts, face muffing but NOTHING about muffs or crests. If it DOES have a tail, then I guess we have to ask the question: "If a UK tailed Araucana is crossed with a UK rumpless Araucana, what are the offspring? The UK Araucana standards don't recognize a tailed AND tufted bird.
I do not have a pea comb but I do have a pea brain and this is all just to confusing for it!