BTC whales embracing Monero is a double edge sword, mark my words...
and why do you think so?
My guess would be that he meant it is hot money. Easy come, easy go. There is some truth to that.
In practice it's the opposite, however. The small fish (if any) jump in and out, it is not even possible for whales.
The liquidity has become really good during the last days. There was a huge pump with 700 BTC involved 2 days ago, and the price increased by 12%, now 2 days later we are hanging around 3-5% gains.