UK "Discs" = US "Rotors" .....
I'm no expert but it is a good theory and one I have both heard of before, and experienced -
albeit on a car with Auto transmission when the foot brake was always kept applied after stopping
at Lights etc, rather than engaging the Parking Brake or setting the Gearbox to "Park".
What seems to happen is that the brake pads -
which have been heated up from the friction of braking,
remain in contact with a small area of the disc after stopping.
The longer and harder the braking was before stopping,
the hotter the discs and pads will be.
As the discs get hot they expand slightly.
After stopping the discs begin to cool down, and contract slightly,
but the portion in contact with the hot brake pad does not cool down as quickly
as it is somewhat insulated by the hot pads surrounding it,
and that section therefore does not contract as much, or as quickly
as the rest of the disc in free air, and this can lead to warping.
By releasing the brake after coming to a stop,
the pads will not be in such tight contact wth the disc.
The effect will still be present, but to a lesser degree.
It might be good practice, depending on individual circumstances, to stop slightly short,
and then every few seconds roll forward ( or back ) slightly so that one area of the disc
is not left constantly under the pads, thus allowing more even cooling to take place

