I'll give you the benefit of the doubt and assume English isn't your native language.
The context of that was winning over marketshare and Linus felt that in order to do that, every distribution should make it a primary goal to make it easier to use. So installing Debian was a "pointless exercise" in that regard because that has never been a primary goal of Debian. As a lot of Debian devs say, you only need to install Debian once on the PC, so it just didn't make sense in the past to put so much effort into an installer as people will only run it once. As long as it works, it was considered to be good enough.