"New kid on the block".
In principle, ask the Company.
As Plan B, I´d upload a couple real closeup pictures, and identify ICs.
In the old days, SMPS design was new uncharted territory and "all were different" ... nowadays that they are becoming mainstream even in Guitar amplification a few basic circuits are becoming popular.
Your SMPS may very well use known ICs and be not too far from datasheet application or at least it might explain how its soft start circuit works ... what I am suspecting here.