It was my prior experience that plats received breakfast at the Mayflower in the past as well. I can tell you that when I called about my fall trips, I was told that was no longer the case.
Of course, I was told that at the JW as well, and all I had to do was ask nicely and I received coupons for breakfast, so YMMV. I do know that the "official" line I received was that it was no longer an automatic platinum perk at the Mayflower or any of the DC hotels where I had previously received coupons.