I have to respectfully disagree as well.
Theres no evidence supporting this other then anecdotal evidence makeing this “bro science” my freind.
Plants can’t tell where the nutrients come from and since nutrients are minerals and there is only 1 form of minerals and it’s not an organic form. The minerals are exactly the same when the plant takes it up and uses it as a building block.
Either microbes turn organic matter into these building blocks or a laboratory isolates the minerals (often from the same organic sources) and makes the building blocks.
But the blocks are the same elements found on the periodic chart.
Here’s a cool chart showing what those elements are that plants need.
@BB3 heating the soil as you described is not going to alter the molecular structure of any nutrients in the soil.
It will kill anything alive both good and bad though.
This is a sure fire way to guarantee you start with a sterile growing medium, but it would be a good idea to reintroduce beneficial microbes.
It’s a crap shoot with bagged soil no matter the brand. Manufacturers may do a great job at building a soil with no pests but they have no control of distribution and storage after that.
I’ve had many of fungus gnats come from FF soil and their coco-coir.
In fact i stopped buying it locally because they store it outside and It seem to always have pests 
I switched to coco-coir and h2o2 with no microbes at all and have better results now then ever in soil.