That's not buyers remorse, it's simply a buying mistake due to poor research.
Buyers remorse is buying something that you didn't really want at all and then regretting it (which in fairness, we've all done).
There's a huge difference between buyer's remorse and a poorly researched purchase decision.
That's a bit trivial because the outcome in either case is a remorse felt by the buyer once they realize their mistake and the end result is they have to return it for something else.