Didn’t say anything about the defensive stats but most of the team’s batting over 300. That’s very good already.
Though it's not as pronounced in recent seasons, the Japanese pro leagues have historically tended toward higher averages and less power, favoring a somewhat less extreme (and less good) version of Ichiro's batting approach. A team full of .300 hitters is still really good but if some of the writing is based off the author's nostalgia for baseball over the last 20+ years it's probably not meant to be as shockingly good as it seems through the lens of a 2024 MLB fan.
It might also be a function of the different approach to pitching, where it feels like lots of Japanese pitchers favor broad arsenals of a ton of different pitches but where none of them are a crazy, dominating, super-weapon of a pitch. You see Japanese pitchers out there and they throw a 4-seam FB, 2-seam FB, cutter, slider, curve, splitter, and some kind of changeup vs your average MLB starter that probably has 1 amazing pitch, 1 pretty good pitch, and 1 average to slightly below average pitch and that's all they use. It works for a pitch-to-contact approach where the goal is to just ensure the batter can't square it up, but it doesn't generate a lot of strikeouts. So the result is a lot of balls in play, a lot of slap or squib singles, and higher batting averages only for runs to be somewhat suppressed because the lack of power means the defense can stop those runners from scoring.
I dunno. I used to follow Japanese baseball a bit but have sort of fallen off of that in recent years as the posting of Japanese players has slowed and only the real unicorn/elite guys even contemplate coming to MLB. It's not like it was 10-15 years ago when you had this big wave of Japanese players trying their hand at MLB and ending up leaving because they just weren't good enough to adjust to a different league with a radically different style of play.