I think it is a political decision that they don’t do that 
They leave it as it is (group syncing is no reason for ban) but don’t want to make to say that so directly, to not p1ss the people off, who wan’t to see this banned.
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The statement itself is true. Group-syncing has been popular since the beginning of epic battlegrounds and nobody has been banned because of it.
Therefore, you can not say that it is untruthful. You can be p1ssed and suggest changes, of course.
(Disclaimer: I am not saying Group-syncing is a good practice, or fair, or good for the PvP community, or anything. But stop lying by STATING it would be against ToS and a reason for bans, calling out leaders to harass, mass-reports, yadda yadda)
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Anyway, the latest “official” answer we could get to this question is here: