If he is lying, why would he have lied about it in May of 2000?
As chasel19 posted in post 107 in the link he sent you, in the year 2000 in that Forbes article they covered this.
“In certain ways, McCain was a natural Web candidate. Chairman of the Senate Telecommunications Subcommittee and regarded as the U.S. Senate’s savviest technologist, McCain is an inveterate devotee of email. His nightly ritual is to read his email together with his wife, Cindy. The injuries he incurred as a Vietnam POW make it painful for McCain to type. Instead, he dictates responses that his wife types on a laptop. “She’s a whiz on the keyboard, and I’m so laborious,” McCain admits.