Lem himself talks about the movie a bit there too, around the 24th minute. He didn't seem fond of Tarkowsky's religiousness and the impact it had on the movie.
Timestamped link: https://www.youtube.com/watch?v=9wQq4aKldaw&t=1434
My impression was similar — the movie seems to be a free retelling and doesn't reflect the book well.
Authors are a bit too involved emotionally to judge movies that are based on their books though. It reveals to them that the interpretation that readers make of their books or their interest in it may not be what the author intended.
I still despise those moralist fables.
But his other works? i love them! My favorite is The Star Diaries, despite having some robot stories in them.
These were really light, nicely done stories but when you think about them, they introduce you to actual.problems that come with robotics and AI.
I am glad that I read those and kind of sad that I did not read more of Lem's books early in my life.
I recently watched “In The Heart Of the Sea” which was an adaptation of a book which recounts the tragedy of the Whaleship Essex in the early 1800s, based on the written accounts of two of the surviving crew. I haven’t read the book, but the movie frames the story as an author interviewing the last remaining survivor in old age.
Having not read Moby Dick, I at first thought this was a movie version as the storyline kind of seemed similar but the events didn’t seem to match to what I knew.
Finally it clicked for me, and revealed at the end, that the interviewer was Herman Melville getting inspiration for his Moby Dick.
The movie has increased my curiosity and desire into reading Moby Didk.
Both Lem (Solaris) and Strugatsky Brothers (Roadside Picnic turned into Stalker) disliked what Tarkovsky did.