Still, it will be silly if he just shows no signs of remembering the huge alien attack that just had happened... retconing that later would also be silly, just like "Oh yeah, that DID happen between the Lizard and Electro insidents, good times..."
Where was Spider-Man during this attack? Helping civillians & fight the aliens? If he was, he certainly was affected directly as well. And he didn't fight, why didn't he? There are certain things you can't just ignore because you assume that they were there. Even in MCU where the status quo is always restored easily, the battle of New York is treated like a really big event. New York and Peter wouldn't be the same. Not to mention that Peter now knows that aliens exist, this alone would affect the way Peter thinks and assesses things
I'm not saying that Peter should say it straight out loud like "There was an alien attack a year ago...", but acting completely like an alien attack didn't happen is silly. If we already knew for sure that Spider-Man was in the MCU it wouldn't be that bad, but we wont even know if the alien attack happened in this universe. The problem is that as long as this is just a Spidey universe it pretends like nothing happened, but when the big reveal comes it will be like "Oh, so it DID happen in this universe...", and that's why it's incredibly silly. I literally can't believe no one is on my side with this yet