I believe you are referring to GM Ip Chun's interview.
He was not actually saying WC is for health only.
This is my best translation on the clip:
GM Ip Chun: "My vision for the future is that, lesser and lesser conflicts will
be resolved by force, and more by negotiation. So how will Wing Chun be
relevant in the far distant future when no force is being used? So what if
you can one versus nine? Nobody will be doing it at that time, and will
Wing Chun be irrelevant and lost then.
In order for Wing Chun to be relevant and be preserved, as martial arts practitioners we must understand it is not only for fighting, but as a way of life, and for contributing to the society. By promoting Wing Chun other than self defence, but also as a way to improve our health
(greatly for me), the human
race will continue to use Wing Chun and Wing Chun will be preserved."