No. Slashely's number is based on opening up five accessory slots on a full team (4 SSR Himes minimum) for each element. That is the expected end goal for Rag farming. He's just mentioning that this is longer to do then getting a full set of phantom weapons and so you'll get those as part of the accessory slot effort. There is less need to stress over phantom weapons and higher priority to pick the Himes you'll unlock 5 slots for as this will take a lot of time.
Dejnov.