So if I understand this correctly there are exactly 222 people who have more than 50K ICN. They'll add them to the test in no time.
Incorrect - these are the unique amounts purchased during ICO. It's possible there are way more than 222 because I for example bought 3 times.
No, it's the amounts per investor. There were 3,508 investors. This is the amount allocated to each individual investor. Presumably 1 investor = 1 ICO account. So your 3 different amounts will only matter if you deposited them on 3 different accounts.
As you can see, there are 3,508 entries on the sheet.