Accuracy matters, especially with something seeped in tradition. The term "kimono" is specific and refers to something specific.

Had she said "I make neo-Kimono", "kimono-inspired" or "kimono-style" she would have been fine. If she had showcased an actual kimono (her site suggests she knows how to make them) she would have been fine.

And for sake of accuracy, the creator is a gal, not a guy.

Source - I bought, what I thought was a kimono, for someone who had always wanted a kimono, from someone who said it was a kimono.

I did not buy a kimono. Thankfully it was still a proper yukata, but it was still not an actual kimono. As such it was received with gratitude but utterly failed to meet the goal. Had it been a faux kimono or faux yukata it would have been met with complete disappointment. So, again, accuracy matters, especially if you are selling your product.