It might have jumped because the market was pricing in a faster decline and it beat expectations, causing a correction.
It could also be because earnings reports are times of higher volatility for a stock, and people will use derivatives to make certain bets around it. And then the earnings results can cause them to take decisive action to exit those positions, which might not be happening in the spot market but the spot market can feel the ripple effects of big movements in derivatives.
Or maybe a bunch of meme investors are buying intel because it had good news and there's nothing more sophisticated than that.
The market is weird, and it's especially weird on short time scales. Let's wait a week and see where they land.
1) dividend was not (any longer?) rational, since they needed to reinvest in production process improvements; this is therefore a good CEO decision, which gives confidence to stock owners that CEO can do what needs to be done
2) "five nodes in four years", i.e. acceleration to catch up in process capability, is said to be on track, which (if actually true) is good news
3) this was the "pain for future gain" part of Gelsinger's turnaround plan, so if they can actually make a profit even during this phase, that is good news
Not sure if I believe any of this, but that's my take on why it might be reason to buy the stock. Not that I am, in fact, actually buying the stock.