if you were really trading in the past 6 months you could have easily made 8x profit from XRP alone. it had a really awesome pump at the start of your investment and because of it the price of XRP went up to 24000 satoshi and that means more than 6x profit if you caught it even midway up to the pump. and a much smaller profit to even losing money if holding it for too long.
6 months ago XRP: 3000 satoshi
top of the pump XRP: 24000 satoshi
profit from selling on top: 8x (700%)
current XRP price: 4000-5000 satoshi
profit from holding: 1.3x (33%)
this is true for all the rest of the altcoins in your list by the way.
Probably hes not selling in the peak of the price, deciding to wait for a moment and ended up selling at the low price, just got trapped by the rumour regarding china's ban toward ICO maybe.
and quite agree that he should have made more profit than he mentioned, such a strange move indeed.