That may be good advice in the sense of being effective, but encouraging people to actively deceive their employers and intentionally do as little as possible is disingenuous and dishonest.
If you don't think that reflects on your integrity, or if you don't consider your integrity worth maintaining, then this really is advice that you could consider good. But telling this to impressionable people who are inexperienced and new to Real Life in general would do them and everyone they'll ever work for a huge disservice.
I think a better version of the parent comment's advice would be figure out what is a reasonable, healthy, sustainable level of productivity and try to work as close to that as possible - and no more.
Yes, this is good advice. It centers on the person and advocates a work/life balance. It doesn't center on the employer and how they can be manipulated and cheated for the employee's benefit.
If you don't think that reflects on your integrity, or if you don't consider your integrity worth maintaining, then this really is advice that you could consider good. But telling this to impressionable people who are inexperienced and new to Real Life in general would do them and everyone they'll ever work for a huge disservice.