I think since Apple's prior stance on styli has been steadfast against it uses, I can only draw a conclusion of Apple copying MS in this case. I don't think Apple and MS are sharing any development at all.
If That was in regards to the 2007 iPhone introduction, then the context should be clear that this was in regards to stilus use with a smartphone. The 2011 patent application seems to refute the claim that Apple was steadfast against the concept.
Remember in 2007 multitouch was new technology, and they were putting all energy into their RDS to get people excited about it as being the input method of the future. I think ( as you and I can only speculate) that their stance was only in marketing their smartphone, and multitouch technology.