maybe the original ‘developer’ looking at this has never done anything beyond the latest angular or react fashion trends, but a redirect after a POST is about as common as it gets. Indicating that “they’re not processing the data” on the server is simply 100% unknowable. Given that it’s the guesswork of someone who probably thinks the only uses for 302 redirects have to do with SEO stuff, their conclusion from the ‘evidence’, such as it is, is useless.