Reading the Frenzy Charger's training "This model ignores the disengaging penalties when disengaging with models with resonate" and comparing it to the disengaging rules in the rulebook we have access to (pg. 11), then yes the models would get to ignore both the movement cost and the inability to re-engage afterwards.
It is a slight inconsistency in wording when compared with the Stalker ability however, so it may be that the wording of the rule is different in the polished rule set. Even if that were the case, it would be good on these guys to allow them to resonate stuff then move off to get into position to resonate some more.
But man these units are TOUGH, I have no clue how one's supposed to take down Gar . . . toughness 2, 3 (or 4 wounds if in charge) with no over and only hurt on 8+ . . . even before getting into his offensive abilities? *shudder*