No it doesn't, overall PC ownership isn't in decline its just people are stopping buying pre-built from places like HP, Dell etc.
Alot more people are building their own or having their own built which do not count towards these figures. I'd also be highly surprised if all the thousands of "boutique" sellers of complete systems on places like ebay are counted towards the figures too.
If pc sales really were in such decline you'd see an awful lot of component suppliers going under like scan, ebuyer, newegg for you americans etc. Not seen any of them go under yet and theres even more boutique high end PC sellers around now than there was 2 years ago when all this doom and gloom started.
Its purely the old guard that's struggling there's nothing to see here move along let them all rot away in peace we'll be better off without them