The only possible way the Lenin/Stalin Soviet leadership would embrace any form of liberalism is if the New Economic Programme was the only possible solution to mass starvation or foreign invasion.
And considering that Lenin relied on Herbert Hoover to combat the first scourge, while Stalin used famine as an instrument of policy and was blithely ignorant about the real threats posed to Mother Russia by the outside world, then no, I can't see these idealogues going for anything that weakens the dictatorship of the proletariat.
Though a Rump Soviet Union adopting enforced liberalism after a Nazi victory isn't that ASBish.
And considering that Lenin relied on Herbert Hoover to combat the first scourge, while Stalin used famine as an instrument of policy and was blithely ignorant about the real threats posed to Mother Russia by the outside world, then no, I can't see these idealogues going for anything that weakens the dictatorship of the proletariat.
Though a Rump Soviet Union adopting enforced liberalism after a Nazi victory isn't that ASBish.