Nothing changes a fact. That's what makes them facts. If you are still undecided about whether Jobs was a POS in his personal life after everything we already know, your lack of objectivity makes your opinion weigh very little in the debate about if his professional accomplishments somehow mitigate that.
'change that fact' can be taken, in this context, to be an abbreviation for 'change the degree to which this fact is relevant to the given discussion'.
...but I'm sure you already knew that.
> your lack of objectivity
You don't sound particularly objective either. But perhaps you never claimed to be. I certainly didn't.
That he was (probably) a bit of a dick isn’t enough to change that fact.