Yep. Their votes, they can use them as they see fit. Treeman's votes are probably wasted, but Gertjan might end up higher.
Basically, it's too early in the voting to say anything about what cards are even in danger of a ban.
Gertjan is an understandable ban.
Mono-resuce users should be very familiar with Elvira and the havoc she caused in elo. Gertjan is a stronger extension of that card and makes Roots a very playable option.
Treeman,now i know i haven't checked elo as much recently,but i don't know what charts you're looking at,but Treeman isnt on anyone's radar...