I read the kol koreh in both languages. I am not a member of the chareidi/yeshivish/chassidic community.
I was not surprised at all by the language and tone. It expresses how the American chareidi community and its leaders feel about Open Orthodoxy, no more and no less. It was not offensive, demeaning, condescending or angry. It does not tell anyone “what to do” operatively when encountering an open orthodoxy person (Can they be identified on the subway? Do they wear OO t-shirts? I wonder).
It will have an effect or not, time will tell. Treating it as a Rashi or Rambam to be dissected on an operative halachic level may be fun, but is pure conjecture at this point. It was a declarative statement and not a plan of action.