Farrrreeeakk.
You have to really read every word carefully.
I kept rereading 91.510 2(c) in disbelief until I finally noticed the keyword and in the preceeding 2(b).
Actually, that fuel-planning section raises an interesting issue if you're in the GAFA (no alternative aerodrome) and the headwinds are worst than planned-for hence you end-up arriving at your destination with less than the fixed-reserve.
As Sunfish said earlier, this section is too blunt an instrument.