It’s a safe bet that if Abrams had an issue with the script’s direction he would have voiced it, and while Abrams isn’t the last word on the topic (that would be Lucasfilm chief Kathleen Kennedy) Abrams would certainly be listened to and there’s a good chance such disagreement would have at least been rumored.
First of all, while Abrams wasn’t directly involved in creating Star Wars: The Last Jedi, he is still an executive producer on the franchise.
It’s not like he had no idea what Rian Johnson was doing.
It’s easy enough to believe that with J.J. Abrams back in charge we’re likely to get a movie like the last one he made, but the answer is actually far from clear.