This person's base premise is wrong. Agile can help you build software that has high quality. I know that it isn't always used in a way that can improve quality

This person's base premise is wrong. Agile can help you build software that has high quality. I know that it isn't always used in a way that can improve quality and, yet, many of the engineering practices (that are often ignored) are quality practices such as pair programming, unit testing, CI, test automation, etc. Sure many agile implementations don't use quality practices and lead to low quality, that doesn't mean those don't exist in agile. The same can be said of all software development methods, if you ignore quality practices, quality will suffer. All software development has to start with the people doing the work.