Is saying, "When you enter your grave, you will see the villa" – when describing the horrors of the grave and what is in it – considered an act of disbelief (kufr)?

We have previously explained to you the necessity of staying away from waswasah (whispers/obsessive thoughts) and have clarified its harm. What happened to you does not constitute disbelief (kufr) or apostasy that takes one out of the pale of Islam.