Some missing facts though, ACO. Meghan's dad and mother released a joint statement for the engagement through KP. KP confirmed that he would be walking her down the aisle early on (but the media loved the drama of doing the will he or won't he, again deciding that settled fact didn't fit their agenda). Meghan has credited her father with a great deal and talked about him articles and interviews. Moreover, her first initial statement when all the wedding drama hit was very, very emotional. Her second statement, what you referenced, was more distant.
Now, I personally think they had a very on/off relationship fraught with difficulties. I tend to think Thomas was perhaps not always the best dad emotionally from tidbits we have gleaned and perhaps even played the siblings off each other. I have detailed my thoughts about their relationship on threads before and I am wary about what the moderating boundaries are on discussing him in this thread. But at the time of the engagement, they seemed to be "on" and Thomas must have been on a prolonged period of decent behavior. Alas, it didn't last.
Valentine Low's article in the Times (an article that lays out a lot of information but somehow comes to some puzzling conclusions) heavily implies that Meghan and Harry blame the
media for her father's antics, not her father necessarily. Low claims that reporters literally rented the houses next to Thomas and found ways to manipulate him and continued to do so for months---despite the pleas and actions taken by Harry and Meghan to stop the press. This lawsuit is really in response to the lines the media crossed with using Markle Sr that upset Meghan and Harry.
I expect, unfortunately, this lawsuit will bring Thomas Sr out of whatever hole he is currently hiding in. The DM may even call him as a witness should it go to trial just to cause further pain to Meghan.
All in all, as Harry himself said, this wasn't the safest action even if it was the right one