User blog comment:DaisySonicFan2000/SNN Adventures - Episode 02: Flopii's party/@comment-4023630-20120501194948/@comment-477304-20120517191840

It did say that the characters got drunk from drinking it, so it was clearly the alchoholic kind. Eggnog traditionally contains alchohol, though there are non-alchoholic versons of the drink you can buy.

But like you said, it's changed now.