As far as I can tell, these can be any type of tatting designs as long as they are original. They don't need to be jewelry, or even wearable. The submission guidelines also indicate that photos illustrating the techniques can be submitted. The requirements about the photo formats are listed in their submission guidelines.
I think if a large number of tatting designers submitted original tatting and/or technique photos this would be fabulous! Just remember that it's not a "failure" if your work isn't selected to be published - you've still made a difference by showing the publishers that tatting is alive and well.
And, when people keep seeing beautiful tatting showcased in a mainsteam magazine, they are going to feel the urge to try it themselves. Think about it - nobody would have bothered to learn beading, knitting, quilting, or any of the other "popular" crafts if they never saw it shown and all they heard about said craft was that (insert name of any craft here)
was a "lost art" that was "too hard" to learn, nobody does that anymore, you can just buy (lace or whatever) at a store, etc.
Anyhow, I think it's totally wonderful that the main editor for a group of popular magazines has a soft spot for tatting! Yippee!