Good research and what you say is true. The DHS will do their own probe, get their own data and will not be hampered by recalcitrant officials.
I am all for investigating voter fraud, although I think prevention is the best way; requiring voter ID, sending all illegal aliens back to their home country, annual auditing of voter rolls to remove people who have died or moved and ensuring that election judges and officials are not overwhelmingly partisan hacks of either party.
I am not for the collection of meta data by any government agency including DHS for the reasons I mentioned in my previous post.