At least in the USA and Latin America where I work I don’t see apparently ethnic South Asian people using wheelchair services more than their representation in the general populace.
What I do know is there’s a standing joke in the airline business about our ability to perform miraculous healing.
On a typical flight I work carrying ~170 passengers we’ll usually have 4-8 people using wheelchairs getting on. Once in a while it’s just 1 or 2 and once in a while it’s 10 or more. But 4-8 is the fat part of the bell curve.
And so upon arrival there will be prearranged the same number of chairs & pushers waiting to take those same people off the plane and to wherever. And somehow on nearly every flight, after the last passenger has left there are still about half the chairs & pushers standing there obstructing the jet bridge after the passengers who needed a wheelchair to get on the plane simply walked past the now-unneeded wheelchair when getting off.
Perhaps oddly, miraculous healing occurs more at out-stations than it does at hubs, and more on domestic arrivals than international ones.
Some of it is totally legitimate, as navigating a large hub may be a longer walk than someone can make or standing in an interminable security or immigration queue may take longer than they can stand up without a break. Whereas walking to the curb in Podunk with no queuing is doable for them.
But it sure smells like a lot of it is an effort to get a free priority service. Miraculous healing is totally a thing. Happens on every flight.