[eruleman]

You’re not familiar with this text or gnosticism.

GPT-4: “In Gnostic texts, particularly those found in the Nag Hammadi library, Thomas is often referred to as "Didymos Judas Thomas." The name "Didymos" is Greek for "twin," and "Thomas" is Aramaic for "twin." In the Gospel of Thomas, one of the Gnostic gospels, Thomas is depicted as having a special understanding or connection to Jesus, but the text does not explicitly state that Thomas is Jesus's twin in a biological sense.

Instead, the "twin" designation may be symbolic, representing a spiritual kinship or a metaphorical relationship rather than a literal familial one. Gnostic texts are known for their symbolic and allegorical language, and the exact nature of Thomas's relationship to Jesus is subject to interpretation. It's also worth noting that Gnostic beliefs were diverse, and different texts might portray the relationship differently.“

[neaden]

Leaving aside GPT as a source you're saying agreeing with OP that Thomas is not traditionally understood to be Jesus' twin brother, except in perhaps a spiritual sense so the summary is wrong.

[stryan]

The summary is written in the context of the tradition the text is in, not an overall Christian/etc context.

[smeej]

What part of where I said I knew that "Thomas" means "the twin," and that no one but apparently whoever wrote this website blurb about this Gnostic gospel has ever thought Jesus had a twin brother suggested to you that I was commenting on the work itself, much less Gnosticism as a whole?