No, because lossy compression has the goal of preserving elements for replay. At the extreme you could turn a movie into subtitles, but not a costume from the movie alone. The costume might contain more information from the movie, but you can meaningfully recreate the movie from a single costume.
The laws alone don’t have enough information to replay their motion without each planets location, a foci, the orbital period, and an associated timestamp or equivalent information.
So, include that data and it’s lossy compression, exclude it and it’s not.
