It mentions > its headquarters had about 1,600 employees, mostly midcareer hires... The average pay is about 9.6 million yen.
Also the job description does not mention software engineers, but "logistics" and such.
I think it is 8.8 million yen for non-tech salaries.
This is much more believable for Japan, where salaries in larger organizations tend to be very structured, and typically not on the high side.
Most cushy jobs offer QoL benefits via non-salary perquisites of some sort or another, and these can be substantial.
Edit: Another possibility is that the $8.8m is the total amount that will be spent on mid-career hires. That would be about right if they bring on 100 people at ~$88k each, and the article mentions bringing on 100 or “even 200” new mid-career hires.