GP is exaggerating, but they definitely do seem to be increasing the number of ads in apps. Apple News (even the paid News+) has tons of ads, often after a single sentence in an article. In AppleTV+ (a service I love!) they’ve removed the image cards of shows in your up next queue on the “What to Watch” page and replaced them with a big auto-playing audio and video preview of one of their shows that’s not in your list. There’s no way to get the old functionality back. I’ve stopped using the app other than from the Home Screen where I have it set to show my “Up Next” queue. It’s really disgusting that they’re making these changes and it’s really turning me off of their services which I loved until recently.
While that's true, the questions was specifically about the claim they are "drowning their software with ads". Providing a single example doesn't really support that claim.
You can get ads for their services (mostly Music an Arcade) in iOS settings (and IIRC System Settings on MacOS), unsolicited push notifications from App Store etc.