I disagree.
If someone is just a casual fan who is only watching the Thor movies and not paying attention to any other MCU films or properties, his being with the Guardians in this movie, regardless of how much they're actually in the film, is going to make no sense without the contextual clues of having seen Avengers Infinity War and Avengers Endgame, which I personally find to be unfortunate.
The MCU films that I have personally connected with (the first two Iron Man movies, the first two Captain America movies, the first 3 Thor movies, The Incredible Hulk, Doctor Strange, Chang-Chi, and Eternals) all work as standalone entities in and of themselves and don't require any significant knowledge of wider events in the MCU to be appreciated.