There's very good advice in there for people in leading or mentoring positions.

I am in academia and I noticed many professors are a mixed bag when it comes to such communication skills. They don't really compliment students much for their work or results. Basically all feedback is target at existing issues and how to improve things. I feel many people can quickly get discouraged by this.

When I give students feedback I always start with thanking them for the work and pointing out some things I think they did very well.. Most students seem to appreciate it a lot.