I don't think it's as egregious as the Chinese judge. I'm assuming for Vincent he was marked lower on PCS than Fernandez/Hanyu/etc. (but not to the degree that people expect) and surpassed them on TES.
Zhou's BV was 18 points higher than Hanyu and 26 points higher than Fernandez.... and that partially contributed to that judge scoring him higher, obviously that judge marked Hanyu/Fernandez a bit more conservatively on GOE and Zhou a bit more generously. It was out of line judging, but given national bias and the fact that Zhou had much higher tech content than Hanyu/Fernandez it's hardly unexpected.
Also, a judge giving a +2 instead of a +1 on a quad/3A means 1 more point added to that judges "individual score". So if they add 1 or more extra GOE to each of their skater's elements, that adds up. For example, on the 4Z+3T, the US judge gave 2.4 points of GOE versus someone like judge 6 giving 0 points of GOE. For the 4Tx, judge 2 gave 2.2 points of GOE versus judge 6 giving 0 points.
At least when judge 2 was an anomaly they might be 1 GOE extra. Compare that to judge 7 for Jin -- giving +3s across the board and a slew of 9.50's. Like, that Chinese judge didn't care - if Jin stayed on his feet, it was a +3.
So ISU are investigating this when all that was affected was a difference of 4th or 5th place which is trivial. I guess if you're not an ISU protected country a touch of berserk judging will have you criminalized whereas if you're protected you could steal a gold medal and have a million signature petition protesting it and the ISU will turn a blind eye. If they want to investigate something, investigate how Uno quad loop wasnt called for when it was clearly under rotated and costed Fernandez a sliver medal rather than investigating into the scoring of a skater who received nothing.