It looks like they just didn’t neutralize/sanitize controllable input data so it should be a pretty easy fix. I think if a security researcher gives you a layup by identifying an easily fixable vulnerability a company should just take it, even if the product is old. If for no other reason than it’s bad marketing when news articles like this come out.
Use a butane insert. Still refillable but it’s sealed in well enough to last years of infrequent use.