That's not quite how accent reduction works. I think the goal is to be clear and understandable in the interview. The accent would have no weight on his professional capabilities.
Learning whatever language you use for work properly and being able to make yourself understood is immensely important.
I work for a company that has a pretty extensive global footprint. Just in the office I work we have around 15 nationalities, and it isn't even a big office.
Just about the only hard requirement I have for people being hired on my team is that they can make themselves clearly understood in english over a dodgy phone connection. Despite the fact that we are a norwegian company, I don't care if people know any norwegian at all. But english they must know. And yes, I have passed on norwegian candidates that could not make themselves understood in english.
And to underline how important people being able to communicate is for me: despite almost exclusively hiring people that are multidisciplinary (just being a software developer isn't enough, you need at least one other skill) I don't care about what education people have and I don't look at their grades.
If you are a developer, the most important language isn't any programming language: it is english.
Clear communication is the most important skill for almost any business person, but certainly for developers.
> B: Uh, maybe a little? I've been taking accent reduction classes and learned to speak without one, but can't keep it up 24/7.
> A: Thanks for your honestly. Unfortunately we'll have to let you go. Please pack your desk.
I believe employers might ask about it. if you tell them you are bettering your communications skills. It can only be a plus? Because this guys is using his spare time to better himself, instead of watching firefly over and over again in hope they will continue the series.