No, they never had it.Wait... modern iPhones don't have landscape any more? (From my iPhone 6s+)
I believe Home Screen landscape mode was removed from iPhones X and beyond, including the Pro Max models, because of the size of the notch.
Not that I'm entirely sure Apple would give the <6.7" Face ID iPhones landscape mode. Landscape mode was after all a bit of a selling point for the Plus models back when they were top-of-the-line. Idk.
Either way, I don't expect any Face ID iPhone will get it "back" until Apple can do a Face ID iPhones with under-display front cameras, no cutouts, no notch, just display.