As a matter of fact, (they only say this because) their secrets have been exposed. If they go back, they will commit exactly the same crimes.* They are liars.
بَل بَدا لَهُم ما كانوا يُخفونَ مِن قَبلُ وَلَو رُدّوا لَعادوا لِما نُهوا عَنهُ وَإِنَّهُم لَكٰذِبونَ
bal badaa lahum maa kaanoo yukhfoona min qablu wa law ruddoo la’aadoo limaa nuhoo ‘anhu wa innahum lakaaziboon
*6:28 This is because as soon as we enter into our worldly dimension, we become totally unaware of events in the dimension of souls, where God and His angels, and Heaven and Hell, can be seen. Thus, the guilty will not change their behavior, even after seeing that eternal dimension.