I heard this before! The old 'tiolet trick' as we call it in 'common England'!!
I think you'll find that there are 'other' reasons for some people 'liking' the WC relationship too. I heard stories once that we are the only style that can maintain all our knowledge whilst IN a toilet cubicle!! This was also a place you may have ended up in if you wanted a challenge fight!?? Similar to an old 'phone box' scenario I once heard
I actually think that it was definitely decided by the HK practitioners to put 'signatures' to certain teachers ways but it may be more linked to the current dictionaries in use at the time imo.