If the effect exists but has no net impact, then that effect might as well not exist. It is meaningless and irrelevant to a discussion on whether a given design is good or bad or what its intentions are.
Let's say that one such person exists, and they personally have caused 5 iPhones over their lifetime to go to the trash pile earlier than they would have if the design was different. In the mean time, in a parallel world, we have different design. And in this other world, 6 iPhones over the same time period go into the trash earlier than they otherwise would have because of faulty water ingress protection where the battery contacts penetrate the shell, or because of a broken battery contact, or because someone put a cheap 3rd party replacement in that caught fire. When we compare the two worlds side by side, we discover then that the "replaceable battery" world is one where the iPhone battery design is the one that drives iPhones to become e-waste faster and drives the sale of more $1k phones.
Since we can't have two parallel worlds, the best we can do is compare the iPhone to other phones and/or look at the size of the effect and whether it's significant enough to show up in design planning. If it does not generate a significant effect on the market, then claiming the effect of this minuscule fraction of people makes iPhones "destined to become e-waste faster than necessary" or that they factor into the design decision because apple wants "to sell entire $1000+ phone/$3000+ laptop upgrades, not replacement batteries." is fallacious. It's fallacious in the same way that claiming that butterflies flapping their wings in Beijing are causing more iPhones to become e-waste sooner than necessary because they contribute to hurricanes and many phones are damaged or lost in such storms. Butterflies might indeed create a very real effect on air currents when they flap their wings. But I'm not about to start an advocacy program for slaughtering butterflies to keep iPhones from becoming e-waste in a hurricane without some evidence that the effect is significant. And no one would accept the claim that butterflies cause iPhones to become e-waster sooner than necessary as true because the effect butterflies have exists, no matter how insignificant it is.