I really object to this relatively modern interpretation of the Disney movie. For all the perfectly valid flaws in Disney movies, this one is far off the mark that I don't understand how it's become so popular, or why even Disney themselves leaned into it.
Ariel in the Disney movie is obsessed with "land culture" long before she ever meets Eric or "falls in love". She has a massive collection of trinkets and artifacts, of which she only has as surface level understanding at best, and a flawed mistranslated one at worst. She's missing family functions for her obsession. She is basically a "weeb" for human culture. Yes, she gets herself love struck when she goes to the surface, but she already wanted to be up there. Her "I want" song comes before she's ever laid eyes on Eric. She's got plans to move, and she's already chafing under her father. Falling "in love" with Eric might be the instigating incident, but she already wants to make a change and get up there. Also bear in mind that she doesn't know anything about Eric at all, she's not "changing herself to win the affections of a boy she just met", they haven't met at all. She's obsessed and made up a fantasy in her head. Again to continue with the weeb analogy, this is like a hypothetical weeb going to an "Atarashii Gakko" concert and deciding they're in love with one of the singers and they're moving to Japan to be with them. It has nothing to do with "love" or "affection" and it's all about the obsession.
Ursula leverages this and the recent fights Ariel has had with Triton to trick her into signing the contract, but again this is about fueling an unrequited (and unknown) obsession, not about trying to do something that she has any reason to believe Eric would be asking of her. And then the ENTIRE rest of the movie drives home the point that she doesn't need to change anything about herself. Remember, Eric is obsessed, with a girl with a pretty voice. He doesn't think Ariel is the girl he's interested in at all. But he falls "in love" with her, the person she is, no changes required. Her lack of voice isn't whats appealing to him. Her legs aren't what's appealing to him. It's her personality, her whole self and she's limited to only being able to express herself as herself via her personality because her captivating voice (and the thing Eric supposedly was in love with) she'd given up. In the end the message isn't "change yourself to win affection" it's quite literally "you are good enough as you are for the right person, even when/if your 'love at first sight' attributes (like your singing voice) are lost"
If one's kids come away from Little Mermaid believing it's ok to change themselves for someone else's affections, one needs to make sure those kids are getting more critical media analysis practice, and maybe also a few sit down talks on their feelings of inadequacy.