There are quiet a few people that reject Chen as "real" Taiji.
OTOH, he himself admits to only teaching the PRC forms and not the traditional family styes.
quote:
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We teach Yang–style Taijiquan, as standardized by the Chinese National Sports Committee.
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One reason for this I think is due to the meeting of a few Masters that decided to call their art "Internal Arts" and because there were no Chen stylists there.
In the end I think it is feeble attempt to make their style and what they do look better by saying "theirs is not the true xyz".