It's illogical that people would do that, but they do. A lot of theory about what's going to work in a fight turns into complex systems, when what consistently works for anyone regardless of style, are the simple things.
Sure, it may just be the case that they've over analyzed things with theory and made expansions they believe to be in line with what Yip Man was teaching, when in actual fact it may just be their own extension and they don't realize it has gone beyond, and so attribute it all back to Yip Man nonetheless... In some cases though, it's fairly obvious they're lying.Those with more detail all say they learned it from YM. I don't think that a) they are lying, b) they 'all' misinterpreted.