I think that is the implication.

Iirc there are some studies saying that people in general are happier when they make small talk with strangers on the train, which i definitely would not expect because i would want to be left alone.

I can imagine a version of this where the two are talking in a way signifying it isn't a private conversation, and the computer guy says something interesting that adds to the discussion, and then all three have an enjoyable social interaction after which he goes back to coding, or whatever.

I think the fantasy that a man could be so attractive as to chat up two women strangers on a train is the kind of idea that leads to harassment.

Weird that this connection is even being done here. Was the girls' consent stated before revealing this meme?