Eligibility requirements for user nominations:From the 1/19 announcement:Position players: 10+ years of ML experience with 300+ PA per season.
From the 1/25 announcement:We are not going to account for players that had ML years generated upon world creation. Eligibility is strictly based on the seasons in which they played.But it looks like they went with the original specs because
Julio Lee is showing up in the Mantle nomination page. He had 13 years of ML service, 4100+ PA's, but only played 7 HBD seasons.
I'm assuming the same holds true for pitchers, but I'm not going to check.