As long as the undocumented API is publicly accessible, and Tinder intends on reporting a users distance to each other (4.5 miles), it will always be possible to triangulate the position.
The only thing I can think of is to obfuscate the user ID in a way that you cant use the ID to guarantee a lookup of the same user.
Of course, you could probably do a lot of requests from different locations and intersect the results to find a more accurate position of the target with this fix too, though with some randomness to each request on the server side it will probably make it not worthwhile.
Either way, it's trivial to take a lat and long and randomise a +/- on each value, or alternatively if you want a ciruclar error randomise a magnitude and angle and resolve the shift to lat and long.