That's not in evidence, and while I lack empirical evidence to prove this, there are logical mechanisms by which Tinder might result in fewer babies. Namely:
1. A lot of people seem to get an attention fix by talking to people and then ghosting them when meeting in person is suggested.
2. The siloing of the dating pool to different sites (Tinder, Bumble, Hinge, OKCupid...).
3. Lots of false positives of matches--someone looks like a good match on paper and then you show up in person and there's something not quite right--their mannerisms annoy you, they smell bad (to you), etc. There are a ton of ways people filter potential dating partners extremely quickly with in person.
4. The massive waste of time might result in a lot of people just giving up.
My personal experience is that every relationship I've had resulted from meeting people in person, despite spending a lot of time on the apps.