What qualifies as New York source income on a W-2 for an out-of-state telecommuter?

I lived and worked in New York from 1/1 to 9/30 and then moved to California. When I moved from NY I began telecommuting from CA for this same New York employer, and stared having CA taxes withheld instead of NY. On my W2 they’ve included a CA state employer’s ID. Does this mean this income earned while in CA is not from an “NY State Source”?