Stalin refers to both. You’ve gotta love his definition of an old Boleshevik:
Things have come to a sorry pass, comrades, if the only reason why we are called old Bolsheviks is that we are old. Old Bolsheviks are respected not because they are old, but because they are at the same time eternally fresh, never-aging revolutionaries (Stalin, Works, vol. 12, p. 2).
As for Plato, I agree with this sentiment:
In olden times it was said about the philosopher Plato: We love Plato, but we love truth even more. The same must be said about Bukharin: We love Bukharin, but we love truth, the Party and the Comintern even more (Works, vol. 12, p. 25).