Not at all. He is the ultimate control freak, and let's not forget. He KNOWS he is guilty, and this suicide attempt is more evidence of his consciousness of guilt IMO. He never intended to be incarcerated again; I have expressed my opinion here before that he was testing the system, to determine its weak links (for purposes of escape), but he was unsuccessful in doing so. What is the ultimate control and escape? Suicide.
This man is a very damaged individual, who has been able to manipulate the legal system for many years. No doubt he was aided by his lawyers (these lawyers IMO are NOT representative of most lawyers), who supported the false narrative that Dulos was the victim. So couple his malignant narcissism with his need to control and escape the situation he has placed himself in, with his dawning knowledge that he was going to be incarcerated, and it becomes clear he was always a suicide risk. I would not be surprised to learn that this plan, like his plan to murder Jennifer, was well thought out in advance. The guy was never going to let anyone be the boss of him. If he recovers, he should be detained for his own safety, and closely monitored IMO.
The timing of this attempt, though, has got to be tied to the fact that he knew the jig was up. The house of cards was tumbling down such that Dulos must have thought he days of freedom were coming to an end. One way or the other, though, Dulos was never going to face the justice he deserved. MOO! MOO!