Sure, some sources categorize anything where you are forcing concentration on an object as "forceful", and shamatha where you focus on nothing and simply let the elaboration clear as "natural", to put it roughly. It's not a value judgement of course, but it seems that different approaches work for different folks. I've read similar descriptions as this from everyone from HHDL to Tenzin Wangyal.
It's not my term either BTW.
this seems to indicate on different stages of shamatha practices as taught in the tibetan buddhist tradition.
1-4 forceful attention
and from the 5th stage onwards you rest without any ''point'' of concentration and from somewhere along the line you start concentrating or resting in awareness. up to the achievement of shamatha.
you can listen to your teacher, but as a note Alan B. Wallace have written in his book how rare the actual accomplishment of shamatha is and how it is a foundation for all other practices, also he stated that it is basically impossible to achieve without retreat and in the past it took 3-9 month of strict retreat but nowadays takes 1-2 years of retreat to accomplish. so forgive me for doubting westerners who live in busy cities not to have accomplished shamatha.