If PR is an invalid metric, then what about no/do follow

Publicly displayed PR has never been a good metric. It was Google's biggest mistake.
 
They all are still relevant however pr is not updated but no-follow/do-follow don't need an update.
 
Does do/no follow still work and pass link juice if there is no pr metric now?

Yes.

PR is not dead, nor invalid, it's just outdated and thus unreliable.
 
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