The Chinese national, 19, had registered to vote on Sunday – using his student ID and other documentation to establish residency. He also signed a document attesting to being a US citizen. The student later contacted the city clerk’s office and attempted to retract the illegal vote, according to Benson’s office – however his ballot had already been processed through the tabulator.

https://www.zerohedge.com/political/chinese-national-charged-voting-illegally-michigan

The vote likely counts.
And the fraud would not have been detected had he not attempted to retract it.
Nor would it have been detected if he’d voted by mail.