No? He may have had his "faults" but I believe he actually did love his children. If he was a rotten father, his daughter (forgot her name) would be treating him like the boys. I think shes trying to support him in fixing the family because she knows he wasnt like that in his heart. And Rei openly admitted to rejecting Dabi and the end of the chapter.
.. he literally abused his wife and children how is that redeemable, it doesn't matter whats in his heart now, the damage is done.
In this chapter it is evident he never even laid hands on them.
He may have mentally abused them, yes, but even if the damage has been done, his efforts aren't useless.
endeavour is an abuser whether you like it or not. dabi is in the wrong rn too but that doesn't take away from the fact that endeavour was a rotten father to his kids