Not that it matters...
I'm afraid I'm a stickler for good naming practices and I'm not fond of the term "English Roses," either. I do, however, find it useful to think of David Austin's roses and those that express his breeding goals as belonging to a group that deserves a distinctive name. His stated goal is to create roses that are cold hardy, disease resistant, shrubby and well branched, remontant, and bearing fragrant flowers that are pretty in bud and open bloom. Of course, it's a descriptive definition of the class. And as with any class description, no rose in the class perfectly matches the ideal.
I wish there were a different nomenclature to refer to Austin's roses and those like them. I think Meilland's "Romantica" term is pretty good, although I'm not sure Meilland has gotten the idea of fragrance being part of the equation quite so well as Austin. I have grown Constance Spry, a rose with big fragrant flowers that makes ten foot long unbranched canes that require some training if it is not to look ridiculous. I see something of that rose in many of Austin's introductions so it seems to me that Austin's roses most closely resemble hybrid perpetual roses in flower form, plant habit, disease (i.e. blackspot) resistance, cold hardiness, and so on. Austin's stated goal of shrubbiness is not a quality that I have seen well expressed by any of the roses of his that I have planted.
When I think of landscape roses I think of plants that are trouble-free and muscular. Roses that paint the landscape with great washes of color for a long time, but do so by making roses that are individually not very pretty. In order to pull off this task they have to be very well branched - much better so than any David Austin rose I have ever grown. And very few of them have rose flowers that are especially pretty or photogenic individually. Landscape roses I see as roses that look great from far away, drawing you into the garden. DA roses draw you near the plant itself so you can stick your nose into a pretty blossom and inhale its delicious scent. Both have an important role to play in the garden; but the roles are different.
I guess I need language to express the distinctions between these two distinct kinds of plants.