It's because the movie originally takes place in the 90s and they decided late in shooting to have it actually coincide with the Tom Holland Spiderman so it was changed to take place in 2002. There's a subplot that goes nowhere with Madam Web's EMT partner "___ Parker" who's sister has a kid on the way and we see them as a baby. I guess they had the rights to "Parker" as a last name but not Uncle Ben Parker