Those folks are decivers... real soil doesnt contain so much non-decomposed material..
they didnt do their job well..
you haven sees any PH swings yet you just started to grow in these medium...
but there is time soon when you could encounter problems i mention..
Look mine personal mix,am made everything from parts that i collect..
its 70% black soil and 30% of wormcastings.. no aerators,no peat
and it holds water very good cause its rich in humus..
There is no chunks of non-decoposed wood as i encounter before they are vectors for getting
fungus gnats and then later some funghus disease that will stunt your plant and yield..
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