I have in the past heard PhD professors give bad and wrong information.
I have heard master gardeners give bad information (none in my county, of course!!
)
I have heard many extension agents give wrong information.
People have what they have, and we generally all repeat what we have learned from others or from our own experiences. When those experiences differ then different conclusions are drawn and we can become dogmatic about an idea.
There is a whole universe of people who believe that cardboard is excellent as the first layer of a new bed. I believe this PhD lecturer is simply wrong to be adamant against the use of cardboard in any circumstance.
