Humboldt said: Not familiar with them.
Tried some quick research on Chinese Evergreen propagation and mostly got results for cuttings and division. No one referenced seeds on basic plant sites.
Saw a bit of discussion in forums about stripping the flesh away from the seed before planting once the berries turn red, 50/50 soil pumice moist but not wet, being patient. Not much else. Not recommending this but that's what was out there.
If you got one last time you did something right.
Any clues as to why it didn't make it past 2"?