I hear so many stories, much of them true from pictoral evidence, that Ideal out-crosses a lot of their rare breeds to get more production, so, I wouldn't be surprised.
But honestly if you want a white laying dual purpose breed, though all of them are rare and it's very hard to find truly dual purpose worthy stock from hatcheries, there's -
Houdans very large, square framed crested bird often with eye-candy mottled coloration
Hollands
Catalanas old Spanish type buff colored bird originally meant as an all-around type bird
La Fleche old French dual purpose breed, like Houdans, highly esteemed for their meat
Crevecoeurs another old French breed with a nice crest, beautiful black color, and meaty body
Sadly though due to their serious rarity all of the above breeds are increasingly difficult to find truly "dual purpose" type stock of anymore.
Oh and, Hollands naturally should ONLY resemble Barred Rocks by their color
Otherwise they're two very different breeds when you're not looking at hatchery stock.