Accuracy in Reporting

Perhaps both

Very few resignations in politics arent the result of someone being threatened with the outing of a scandal or merely being sacked anyway

Well the term resignation in its purest sense implies an undirected personal choice to quit

Whereas being fired in its purest sense implies having no choice of staying

But in the real world many if not most “resignations” are someone being given the choice TO quit when they dont want to or face being sacked AND publicly hummiliated in the process

So in this case as with many others both terms would be correct, the person would be sacked if they hadnt made the choice to quit so its not really a resignation in the true unforced sense of the word, its merely someone with NO real choice opting for the less publicly embarassing of the two options available to them, so its not really much of a choice at all

So, one of the news teams could have heard reliably that the person was being forced out and in effect sacked or more acurately “gottten rid of”, but the other one could prefer to just report the official statement that the person CHOSE to resign of their own free will with no pressure being applied

There can only be one official statement, but both versions can be totally true too