en.wikipedia.org/wiki/Timothy_McVeigh

This sentence appears to combine federal charges that were actually filed with state charges that were only contemplated.

The Justice Department's 1995 annual report says the bombing investigation "led to the Federal indictment of Timothy McVeigh and Terry Nichols" on charges including use of a weapon of mass destruction, destruction of a federal facility, and first-degree murder. It does not describe a state indictment against McVeigh.

A later Oklahoma City bombing recap from KOCO likewise says McVeigh was charged federally and that murder charges were not brought against McVeigh for all of the people killed; instead, Oklahoma County District Attorney Bob Macy said he was going to file the other 160 murder charges after Terry Nichols' trial. That wording shows the 160 state charges were planned, not already indicted.

History.com similarly describes McVeigh as having been convicted in federal court on 11 counts, while noting that Nichols, not McVeigh, was later charged and convicted in Oklahoma state court.

So the claim that McVeigh was already "indicted on 160 state offenses" is incorrect. A more accurate summary would be that McVeigh was federally indicted on 11 counts, while Oklahoma prosecutors discussed possible later state murder charges that were not part of his initial indictment.