Yes, or at least that's what I think it is.
And after looking at my other (shoulder, sorry) planes, this one is not the only one with a mouth that slopes down and forward.
My Stanley. Clifton, LN, LV and Record all form a mouth by abutting the leading edge of the mouth perpendicular to the sole or with a slight pitch up and forward.
The Bench Dog and the HNT Gordon pitch down and forward, allowing the blade's bevel to ride up close.
I'd never noticed that.