Based on what I see from their kilts here:
http://thejarlsoflochlann.com/Kilts/special.html
I'd say no.

They are like a traditional kilt in that they are box pleated. And I would assume that they also would have around 4 yards of cloth, just from the look of them.

But they have a lot of modern amenities that I would say in no way are traditional (not that they are bad, mind you, just not traditional). The pockets, the removable snap-on apron, and the belt loops all would be absent from a traditional box-pleated kilt.

It also looks like all their work is machine sewn, whereas your traditional kilt would be hand sewn.

When I looked at their tartan selection for their "Monster" Kaber Kilts, all I saw available was 12 oz. cotton, or 10 oz and 13 oz wool. I think that (other than the 13 oz wool) this is much too light and will affect the hang of the kilt. I personally reccomend a 16 oz weight for my four-yard box pleated kilts, though a 13 oz also works well. I wouldn't go any lighted than that in a four yard kilt.

I kind of like the look of their Oarsman kilts, though. Anyone who owns one want to let us know how they look and hang?
Aye,
Matt