The Earth’s moon is believed to have formed from a similar process, the researchers explained in a written statement, but it was more like a slap in the face rather than a kiss.
See above caveat from the article that makes the title a bit misleading.
A kiss-and-capture scenario works for Pluto-Charon because those two planets are so compositionally different.
The Earth and Moon are so compositionally similar, that in an impact scenario they would have needed to exchange a lot of material. It would need to be a catastrophic impact, not just a kissing/glancing blow. More of an explosive round that penetrates and detonates its energy. Boom and reform, not just a slap to the face.
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