Lynkhart· Last seen in Skyrim...
Actually if you look at their initial pitch for this wheelchair they acknowledge that it is the only one CURRENTLY on the market, and refer back to the Barbie one of the past. 1/6 scale ones don't count in this instance as they aren't marketed as toys, which this is. Personally I think the design of the Mattel one is superior as it's more realistic but I love the fact that they're branching out a bit in response to what some of their customers were asking for..
I am tempted to say, somewhat unkindly, that once again this Lammily Kickstarter guy reinvents the wheel (this time literally) by claiming this is "The only fashion doll sized wheelchair on the market." I suppose technically he is right in the immediate Winter 2018 market but there was the Barbie wheelchair Pontiacivan mentioned, quite nice, that was available at various times (google "Becky the School Photographer" or "Becky Share a Smile") and on our side of the hobby there were Professor X chairs, and an excellent retro wheelchair that I got loose and <probably> belonged to Roosevelt.