Which was stupid. They should have continued to impeach because then they could legally bar him from running from office again.
There is no reason why a president should be immune from prosecution for crimes committed during the presidency.
Can you really think of no way to abuse this? Imagine when Biden leaves office if Texas tries to prosecute him for "dereliction of duty" or on whatever Texas' equivalent of a RICO charge is because his actions "assisted organized crime". Should they be allowed to?
Which is why you need an impeachment as punishment for it can include being barred from holding public office.