And using what they are terming "synthetic shorting", ie; Naked Shortselling schemes...
No. Synthetic shorting is done with derivatives. It is not what most people would call "naked shorting". It can, however, cause serious market disruption.
Options MMs used a form of synthetic shorting to hedge their activity in stocks like Overstock. Eventually the SEC plugged that loophole, but others have been exploited in recent years.
Contrary to what you appear to believe, the Trump administration was not big on regulation. Perhaps something will be done now.