According to latest review of Sony a7 III (B&H Photo/Adorama/Amazon) by amazingsky, Alan Dyer said that the new Sony a7 III has no star eater issue, he thinks that Sony has resolved now.
From amazingsky:
I did not see any significant “star eating” in any long exposures even up to the 4 minutes I used for some deep-sky shots. In images taken at the same time with other cameras not accused of star eating, the Sony showed just as many faint stars as the competitors. Long exposures showed just as many stars as did short exposures.
This was true whether I was shooting compressed or uncompressed RAW photos, with or without Long Exposure Noise Reduction. Neither compression nor LENR invoked “star eating.
You can read full review at amazingsky.