iPhone 9/SE 2
I’ve seen people on the internet say that the new iPhone 9/SE 2 does not have features for Animoji or Memoji. Is this true?
That is correct.
See here: iPhone - Compare Models - Apple
The iPhone SE with the less capable Camera does not support the animated Animojis or Memojis. You can however use the Memoji sticker packs, and use a personalized Memoji sticker pack.
See here: Use stickers with iMessage on your iPhone, iPad, and iPod touch - Apple Support