Can I define this ESlint warning as "unreachable code"? eslint - 'xxxx' is defined but never used. (no-unused-vars)

I was reading about how to detect "unreachable code" and "dead code", during the development I saw this warning but I was not sure if it's an indication of "unreachable code"

The code:

// Edit form process 

app.put('/ideas/:id', csrfProtection, (req, res) 
Ideaa.findOne(1 _id: req.params.id }) 
  .then((idea123) { 
    idea123.title = req.body.title; 
    idea123.details = req.body.details; 
    idea123.save().then((idea321) = { 
    res.redirect(Yideas'); 
    }); 
  }); 
});

from Can I define this ESlint warning as "unreachable code"? eslint - 'xxxx' is defined but never used. (no-unused-vars)