I have no idea what the law is in India, but if he got a “hacking” charge for this it would be a gross miscarriage of justice, considering he never once did anything resembling social engineering, brute forcing passwords, any sort of injection attack, or anything else that might actually be involved in hacking.
However, assuming he never tried to reach out to the company themselves first (and I saw no indication in the article that he had), this is really quite a horrible irresponsible disclosure. It’s pretty obviously a significant leak of sensitive data—both customer and business data—and giving them 90 days to fix it before alerting the public to what you found is pretty basic security ethics.
If it’s one of these QR codes at a restaurant for ordering, the parameters could possibly be necessary to properly connect your order to your table, depending on how they’re set up.