I guess so, that must be the facto.
I have 850 hours playing pokemmo, and I have not got any shiny pokemon, I used 1100 Leppa Berry and I cant find one shiny pokemon.
It seems that this is a lie, since I have seen players who find 2 to 3 shiny pokemon in a day, or in less than 3 days, it makes me that there must be some other factor to find pokemon shinys