The short version is:
Really, El Reg. 'On premise'? We expect better.
The long version is:
WTF is "on premise"? The only way that phrase is correct is if the author (who is alas not alone in this hideous misappropriation) is a steaming cretin. It's premiseS. The terminal S is important. Speaking of 'on-premise' IT makes no sense whatsoever. Each and every person who uses this intensely cretinous phrase just appears illiterate, irredeemably dumb or that they don't care. Whichever it is, it's a terrible, enormous shame.
There's a difference between language evolving and the spreading of stupidity: I guarantee this phrase was started by someone wasn't bright enough to realise the difference in the words. I correct everyone I meet who uses this phrase: I implore you all to do the same.