He would have really wanted to have seen this When I was watching YouTube videos, I found expressions like, "He would have really wanted to have seen this" "He would have love to have seen this" I don't understand why there is have+PP again after "wanted to" or "love to"? Can I also say, "He would have really wanted to see this" or "Alex would have love to see this" , instead? If I say so, is there any differences in meaning?

My English When I was a kid, most schools in Japan started English educations from 1st grade of junior high school (I know recently Japanese government changed the school curriculum to start English education from elementary school.) That means, I’ve been studying English over 20 years since then. It is surprising to me because I still feel my English is poor and I always have to feel intimidated when I talk to native speakers. To improve my English, I’ve been watching English dramas in Netflix these days. Firstly, I watch a scene without subtitles, then pause, rewind and watch with English subtitles, check dictionaries (Actually I don’t have dictionaries, just google it) if there are any unknown words, then rewind again and watch without subtitles, finally move to the next scene. This takes time, but it’s fun to me because I can learn tons of new words, expressions, and fast pronunciations by native speakers. For new vocabularies, I take notes in my smartphone with example sentences and look again when I have time to check if I remembered the words. On the other hand, this work also makes me depressed because those new vocabularies are literally limitless to me. It makes me feel as if I can never understand these dramas without subtitles. Of course, there are no subtitles in real life communication and I am still unable to feel confidence in communication with native speakers. I know it needs time and continuous efforts. One day I want to feel confident to my English skill and talk to anyone in English without any hesitations!