Your ex husband decided to use the Will to punish his daughter for being estranged from him. He clearly thinks your daughter is at fault for the estrangement and sees himself as a 'victim'.
Your ex husband is an adult, and could have contacted his daughter to try and forge a relationship with her. He hasn't, because that takes effort, and beyond the superficial interest he isn't bothered. Of course, I'm sure to his family/friends, he's the 'poor Dad, who's daughter has been alienated, against him' and 'he's tried, but she's been poisoned against him'. The usual bollocks, these men like to say, when the truth is, they're not really bothered.
Yes, your ex husband is a nasty, vindictive man, but you already know that. Perhaps his behaviour in this situation shouldn't be that surprising. It's hurtful towards your daughter, but sadly, that was his intention. All I can say is, your daughter has made the correct decision in having no contact with her Dad. This incident should cement that in her mind, and give her no doubts at all. Be there to support her and maybe suggest some counselling to help her work though her feelings/emotions. It may then give her some form of 'closure'.