I think what they mean is to avoid boutique power conditioners, that are not actually rated as surge protectors.
Here's my current thoughts on the matter.
http://inatinear.blogspot.com/2019/04/power-management-for-frugal-audiophiles.html
Here's my current thoughts on the matter.
http://inatinear.blogspot.com/2019/04/power-management-for-frugal-audiophiles.html