false hope and delusion

ذَرْهُمْ يَأْكُلُوا۟ وَيَتَمَتَّعُوا۟ وَيُلْهِهِمُ ٱلْأَمَلُ ۖ فَسَوْفَ يَعْلَمُونَ

Let them eat and enjoy themselves and be diverted by [false] hope, for they are going to know.

تَظُنُّ أَن يُفْعَلَ بِهَا فَاقِرَةٌ

Expecting that there will be done to them [something] backbreaking.