Going by the logic presented in the article, almost any new processor is simply an overclock.
Using his logic all Northwood's beyond the 1.6A are simply 'overclocked' Northwood's, there is nothing "new" or special about them just a higher FSB and/or multiplier.
All AthlonXP's are simply 'overclocked' dirivatives of the original.
All Pentium 4 Willamette's would simply be 'overclocked' dirivatives of the Pentium 4 1.3GHz, merely a higher multiplier.
It's just typical speed binning, some can do it 800MHz, others can hit 1GHz, and a small few can do 1.25GHz.
It's no different then what AMD/Intel/Alpha/Sun/IDT/Cyrix and a dozen others have always done.
Apple guarantees the processors to run at 1.25GHz- that by necessity means they are not overclocked.
They don't guarantee their 1GHz chips to run at 1.25GHz- their different speed grades of the same processor.