It's very hard for me to believe that any illegal, let alone 95K of them, would be stupid enough to walk into a voting precinct and risk immediate deportation just so they could cast a single vote.
Have you not heard of the Motor Voter Law?
The methodology of the "study" is highly suspect.
1. The looked at applications for driver's licenses which used green cards or visas as ID.
2. Then they looked at voter registration rolls in subsequent years to see if these peoples' names appeared on the voter rolls.
3. And they also looked to see if these people had voted when listed on the rolls.
What they didn't do was to check to see if these people had received citizenship after they got their drivers' licenses and before they voted. The merely assumed that they had not.