Exactly. Dershowitz is stating the obvious, its easy for a prosecutor to get an indictment.
There’s a facetious saying in legal circles about the ease with which prosecutors can secure indictments in grand jury cases: You can get a grand jury to “indict a ham sandwich.
The saying originated during the reign of Manhattan DA Frank Hogan. Who did indeed indict thousands, sometimes with little cause. And if Trump is indicted his trial will be in the District where his conviction is as certain as a Frank Hogan indictment.