The 3D printer market isn't based on selling $20 cables for $3k based on some bullshit pseudo-science marketing.
I remember the first time I saw audiophile cables that had an "electron flow direction" marked on them and I kinda knew right then what this was all about.
In this case, Mark tried to give them the benefit of the doubt, explaining that even if the circuit is a reference design, spending time to match components might make it better than it would be otherwise. It wasn't a bashing, but seemed like a repair video in good faith.