Since compacta is a slow processing plant, it is very common that a plant that has been neglected for a while will display the full effects of that neglect after normal care has been resumed. It is a delayed reaction which does commonly cause confusion. From what you describe, it sounds like some permanent root damage has occurred during the period of neglect effectively cutting off or dramatically diminishing the plant's ability to absorb and deliver water. I believe the growth on the tips is living on reserve water between the space where the stalks have wrinkled and bent and in the crow. Once that water is gone, the foliage crowns will completely die.
To revive this plant the leaf crowns will have to be removed. Check the remaining stalks for overall stability. If the whole stalk moves from side to side with ease, the root structure is very weak. If the stalks are still sturdy, there may be a reliable root structure left.
Water what is left consistently, and allow the soil to dry between waterings. It is common for people to overcorrect an issue like this with too much or frequent watering. This will further damage any remaining roots.
If the plant has been able to hold onto enough root structure and has enough viable plant cells left in the stalk, it will slowly begin to regenerate foliage. If too many roots and remaining plant cells have been damaged the remaining stalk will not be able to absorb water and will ultimately die. If this is the case, you will continue to see more wrinkling and discoloration of the remaining stalks.