There's a small mistake in the article. The seed contains a checksum which makes it actually 128-bit - exactly the same as private key.
Ever wondered if you should use a 12 or 24 word seed for your Bitcoin?🔑
Wonder no longer as our most recent blog post details why 12 words should be the standard across the space as they bring better UX and no loss in real-world security.
https://foundationdevices.com/2023/06/make-12-words-the-standard/
Discussion
Updated, thank you!