From the article you quoted, no it doesn't. (emphasis added )
" ... x64 is a generic name for the 64-bit extensions to Intel's and AMD's 32-bit x86 instruction set architecture (ISA). AMD introduced the first version of x64, initially called x86-64 and later renamed AMD64. ....
x64 doesn't stand by itself. It isn't distinct architecture. It is a variant on x86 (an extension ). In the context of talking about whether Intel is going to fab x86 , ARM , PowerPC , or SPARC chips, the sub-extensions of x86 aren't all that relevant. Just like MIPS32 and MIPS65 are covered by MIPS. ARM's 16, 32, and now 64 variants are covered by ARM. PowerPC 32 and 64 variants are PowerPC .