An internet search will say that GD is highly susceptible to russet from various sources over many years.
Does Stark still sell the original (Mullins) strain? Or when did they stop…then start selling Gibson?
A member on here stated that the trees that they received from Stark Bros said (Gibson).
So unless someone on here has the original Mullins strain from the very few sources of it… then likely those stating that they have the ‘real’ Golden Delicious are actually growing Gibson/Smoothee