He (Shaytan) makes promises to them, and arouses in them false desires;

explains the true reality. Surely, Shaytan deceitfully promises his supporters and tempts them into believing that they are winners in this and the Hereafter.

This is why Allah said, 
وَمَا يَعِدُهُمُ الشَّيْطَانُ إِلاَّ غُرُورًا
 (and Shaytan's promises are nothing but deceptions).

Allah states that on the Day of Return,

وَقَالَ الشَّيْطَانُ لَمَّا قُضِيَ الَامْرُ إِنَّ اللّهَ وَعَدَكُمْ وَعْدَ الْحَقِّ وَوَعَدتُّكُمْ فَأَخْلَفْتُكُمْ وَمَا كَانَ لِيَ عَلَيْكُم مِّن سُلْطَانٍ

And Shaytan will say when the matter has been decided:"Verily, Allah promised you a promise of truth. And I too promised you, but I betrayed you. I had no authority over you, until, 
إِنَّ الظَّالِمِينَ لَهُمْ عَذَابٌ أَلِيمٌ
 (Verily, there is a painful torment for the wrongdoers). (14:22)

Allah's statement