Wheat malt in a Stout... why not? Unusual, but go for it and enjoy the experience and results. For some reason... even though they didn't use wheat, when I read this I thought about Watney's Cream Stout. I might have to clone that soon, since the brewery faded away 25-30 years ago. I loved that beer. That's the 1 that developed my love for Stouts.
I do a porter with 20% wheat malt and it works really well. Foam for days. I would have used about 5% torrified wheat in this stout, but I used it all up in my last saison.