/stats block command not applying to entity selectors in chat

If typed in chat, the /stats block ~ ~-1 ~ set SuccessCount @e[type=Squid] SucessCount
does not apply to the squid, but to a imaginary player, which can't be selected by command blocks, because you simply can't do /scoreboard players set @e[type=Squid] 0 which would target the squid but the imaginary player.